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1673 lines
54 KiB
1673 lines
54 KiB
"""
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test .agg behavior / note that .apply is tested generally in test_groupby.py
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"""
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import datetime
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import functools
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from functools import partial
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import re
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import numpy as np
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import pytest
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from pandas.errors import SpecificationError
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from pandas.core.dtypes.common import is_integer_dtype
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import pandas as pd
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from pandas import (
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DataFrame,
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Index,
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MultiIndex,
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Series,
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concat,
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to_datetime,
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)
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import pandas._testing as tm
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from pandas.core.groupby.grouper import Grouping
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def test_groupby_agg_no_extra_calls():
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# GH#31760
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df = DataFrame({"key": ["a", "b", "c", "c"], "value": [1, 2, 3, 4]})
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gb = df.groupby("key")["value"]
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def dummy_func(x):
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assert len(x) != 0
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return x.sum()
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gb.agg(dummy_func)
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def test_agg_regression1(tsframe):
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grouped = tsframe.groupby([lambda x: x.year, lambda x: x.month])
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result = grouped.agg("mean")
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expected = grouped.mean()
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tm.assert_frame_equal(result, expected)
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def test_agg_must_agg(df):
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grouped = df.groupby("A")["C"]
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msg = "Must produce aggregated value"
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with pytest.raises(Exception, match=msg):
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grouped.agg(lambda x: x.describe())
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with pytest.raises(Exception, match=msg):
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grouped.agg(lambda x: x.index[:2])
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def test_agg_ser_multi_key(df):
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f = lambda x: x.sum()
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results = df.C.groupby([df.A, df.B]).aggregate(f)
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expected = df.groupby(["A", "B"]).sum()["C"]
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tm.assert_series_equal(results, expected)
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def test_groupby_aggregation_mixed_dtype():
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# GH 6212
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expected = DataFrame(
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{
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"v1": [5, 5, 7, np.nan, 3, 3, 4, 1],
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"v2": [55, 55, 77, np.nan, 33, 33, 44, 11],
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},
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index=MultiIndex.from_tuples(
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[
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(1, 95),
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(1, 99),
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(2, 95),
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(2, 99),
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("big", "damp"),
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("blue", "dry"),
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("red", "red"),
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("red", "wet"),
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],
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names=["by1", "by2"],
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),
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)
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df = DataFrame(
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{
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"v1": [1, 3, 5, 7, 8, 3, 5, np.nan, 4, 5, 7, 9],
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"v2": [11, 33, 55, 77, 88, 33, 55, np.nan, 44, 55, 77, 99],
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"by1": ["red", "blue", 1, 2, np.nan, "big", 1, 2, "red", 1, np.nan, 12],
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"by2": [
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"wet",
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"dry",
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99,
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95,
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np.nan,
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"damp",
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95,
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99,
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"red",
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99,
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np.nan,
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np.nan,
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],
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}
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)
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g = df.groupby(["by1", "by2"])
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result = g[["v1", "v2"]].mean()
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tm.assert_frame_equal(result, expected)
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def test_groupby_aggregation_multi_level_column():
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# GH 29772
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lst = [
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[True, True, True, False],
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[True, False, np.nan, False],
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[True, True, np.nan, False],
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[True, True, np.nan, False],
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]
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df = DataFrame(
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data=lst,
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columns=MultiIndex.from_tuples([("A", 0), ("A", 1), ("B", 0), ("B", 1)]),
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)
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msg = "DataFrame.groupby with axis=1 is deprecated"
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with tm.assert_produces_warning(FutureWarning, match=msg):
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gb = df.groupby(level=1, axis=1)
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result = gb.sum(numeric_only=False)
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expected = DataFrame({0: [2.0, True, True, True], 1: [1, 0, 1, 1]})
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tm.assert_frame_equal(result, expected)
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def test_agg_apply_corner(ts, tsframe):
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# nothing to group, all NA
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grouped = ts.groupby(ts * np.nan, group_keys=False)
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assert ts.dtype == np.float64
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# groupby float64 values results in a float64 Index
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exp = Series([], dtype=np.float64, index=Index([], dtype=np.float64))
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tm.assert_series_equal(grouped.sum(), exp)
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tm.assert_series_equal(grouped.agg("sum"), exp)
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tm.assert_series_equal(grouped.apply("sum"), exp, check_index_type=False)
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# DataFrame
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grouped = tsframe.groupby(tsframe["A"] * np.nan, group_keys=False)
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exp_df = DataFrame(
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columns=tsframe.columns,
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dtype=float,
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index=Index([], name="A", dtype=np.float64),
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)
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tm.assert_frame_equal(grouped.sum(), exp_df)
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tm.assert_frame_equal(grouped.agg("sum"), exp_df)
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msg = "The behavior of DataFrame.sum with axis=None is deprecated"
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with tm.assert_produces_warning(FutureWarning, match=msg, check_stacklevel=False):
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res = grouped.apply(np.sum)
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tm.assert_frame_equal(res, exp_df)
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def test_agg_grouping_is_list_tuple(ts):
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df = DataFrame(
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np.random.default_rng(2).standard_normal((30, 4)),
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columns=Index(list("ABCD"), dtype=object),
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index=pd.date_range("2000-01-01", periods=30, freq="B"),
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)
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grouped = df.groupby(lambda x: x.year)
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grouper = grouped._grouper.groupings[0].grouping_vector
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grouped._grouper.groupings[0] = Grouping(ts.index, list(grouper))
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result = grouped.agg("mean")
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expected = grouped.mean()
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tm.assert_frame_equal(result, expected)
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grouped._grouper.groupings[0] = Grouping(ts.index, tuple(grouper))
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result = grouped.agg("mean")
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expected = grouped.mean()
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tm.assert_frame_equal(result, expected)
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def test_agg_python_multiindex(multiindex_dataframe_random_data):
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grouped = multiindex_dataframe_random_data.groupby(["A", "B"])
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result = grouped.agg("mean")
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expected = grouped.mean()
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize(
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"groupbyfunc", [lambda x: x.weekday(), [lambda x: x.month, lambda x: x.weekday()]]
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)
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def test_aggregate_str_func(tsframe, groupbyfunc):
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grouped = tsframe.groupby(groupbyfunc)
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# single series
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result = grouped["A"].agg("std")
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expected = grouped["A"].std()
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tm.assert_series_equal(result, expected)
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# group frame by function name
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result = grouped.aggregate("var")
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expected = grouped.var()
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tm.assert_frame_equal(result, expected)
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# group frame by function dict
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result = grouped.agg({"A": "var", "B": "std", "C": "mean", "D": "sem"})
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expected = DataFrame(
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{
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"A": grouped["A"].var(),
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"B": grouped["B"].std(),
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"C": grouped["C"].mean(),
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"D": grouped["D"].sem(),
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}
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)
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tm.assert_frame_equal(result, expected)
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def test_std_masked_dtype(any_numeric_ea_dtype):
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# GH#35516
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df = DataFrame(
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{
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"a": [2, 1, 1, 1, 2, 2, 1],
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"b": Series([pd.NA, 1, 2, 1, 1, 1, 2], dtype="Float64"),
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}
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)
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result = df.groupby("a").std()
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expected = DataFrame(
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{"b": [0.57735, 0]}, index=Index([1, 2], name="a"), dtype="Float64"
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)
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tm.assert_frame_equal(result, expected)
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def test_agg_str_with_kwarg_axis_1_raises(df, reduction_func):
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gb = df.groupby(level=0)
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warn_msg = f"DataFrameGroupBy.{reduction_func} with axis=1 is deprecated"
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if reduction_func in ("idxmax", "idxmin"):
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error = TypeError
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msg = "'[<>]' not supported between instances of 'float' and 'str'"
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warn = FutureWarning
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else:
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error = ValueError
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msg = f"Operation {reduction_func} does not support axis=1"
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warn = None
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with pytest.raises(error, match=msg):
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with tm.assert_produces_warning(warn, match=warn_msg):
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gb.agg(reduction_func, axis=1)
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@pytest.mark.parametrize(
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"func, expected, dtype, result_dtype_dict",
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[
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("sum", [5, 7, 9], "int64", {}),
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("std", [4.5**0.5] * 3, int, {"i": float, "j": float, "k": float}),
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("var", [4.5] * 3, int, {"i": float, "j": float, "k": float}),
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("sum", [5, 7, 9], "Int64", {"j": "int64"}),
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("std", [4.5**0.5] * 3, "Int64", {"i": float, "j": float, "k": float}),
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("var", [4.5] * 3, "Int64", {"i": "float64", "j": "float64", "k": "float64"}),
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],
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)
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def test_multiindex_groupby_mixed_cols_axis1(func, expected, dtype, result_dtype_dict):
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# GH#43209
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df = DataFrame(
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[[1, 2, 3, 4, 5, 6]] * 3,
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columns=MultiIndex.from_product([["a", "b"], ["i", "j", "k"]]),
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).astype({("a", "j"): dtype, ("b", "j"): dtype})
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msg = "DataFrame.groupby with axis=1 is deprecated"
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with tm.assert_produces_warning(FutureWarning, match=msg):
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gb = df.groupby(level=1, axis=1)
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result = gb.agg(func)
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expected = DataFrame([expected] * 3, columns=["i", "j", "k"]).astype(
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result_dtype_dict
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)
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize(
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"func, expected_data, result_dtype_dict",
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[
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("sum", [[2, 4], [10, 12], [18, 20]], {10: "int64", 20: "int64"}),
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# std should ideally return Int64 / Float64 #43330
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("std", [[2**0.5] * 2] * 3, "float64"),
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("var", [[2] * 2] * 3, {10: "float64", 20: "float64"}),
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],
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)
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def test_groupby_mixed_cols_axis1(func, expected_data, result_dtype_dict):
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# GH#43209
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df = DataFrame(
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np.arange(12).reshape(3, 4),
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index=Index([0, 1, 0], name="y"),
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columns=Index([10, 20, 10, 20], name="x"),
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dtype="int64",
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).astype({10: "Int64"})
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msg = "DataFrame.groupby with axis=1 is deprecated"
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with tm.assert_produces_warning(FutureWarning, match=msg):
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gb = df.groupby("x", axis=1)
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result = gb.agg(func)
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expected = DataFrame(
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data=expected_data,
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index=Index([0, 1, 0], name="y"),
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columns=Index([10, 20], name="x"),
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).astype(result_dtype_dict)
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tm.assert_frame_equal(result, expected)
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def test_aggregate_item_by_item(df):
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grouped = df.groupby("A")
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aggfun_0 = lambda ser: ser.size
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result = grouped.agg(aggfun_0)
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foosum = (df.A == "foo").sum()
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barsum = (df.A == "bar").sum()
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K = len(result.columns)
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# GH5782
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exp = Series(np.array([foosum] * K), index=list("BCD"), name="foo")
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tm.assert_series_equal(result.xs("foo"), exp)
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exp = Series(np.array([barsum] * K), index=list("BCD"), name="bar")
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tm.assert_almost_equal(result.xs("bar"), exp)
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def aggfun_1(ser):
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return ser.size
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result = DataFrame().groupby(df.A).agg(aggfun_1)
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assert isinstance(result, DataFrame)
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assert len(result) == 0
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def test_wrap_agg_out(three_group):
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grouped = three_group.groupby(["A", "B"])
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def func(ser):
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if ser.dtype == object:
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raise TypeError("Test error message")
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return ser.sum()
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with pytest.raises(TypeError, match="Test error message"):
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grouped.aggregate(func)
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result = grouped[["D", "E", "F"]].aggregate(func)
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exp_grouped = three_group.loc[:, ["A", "B", "D", "E", "F"]]
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expected = exp_grouped.groupby(["A", "B"]).aggregate(func)
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tm.assert_frame_equal(result, expected)
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|
|
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def test_agg_multiple_functions_maintain_order(df):
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# GH #610
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funcs = [("mean", np.mean), ("max", np.max), ("min", np.min)]
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msg = "is currently using SeriesGroupBy.mean"
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with tm.assert_produces_warning(FutureWarning, match=msg):
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result = df.groupby("A")["C"].agg(funcs)
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exp_cols = Index(["mean", "max", "min"])
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tm.assert_index_equal(result.columns, exp_cols)
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|
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def test_series_index_name(df):
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grouped = df.loc[:, ["C"]].groupby(df["A"])
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result = grouped.agg(lambda x: x.mean())
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assert result.index.name == "A"
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|
|
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def test_agg_multiple_functions_same_name():
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# GH 30880
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df = DataFrame(
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np.random.default_rng(2).standard_normal((1000, 3)),
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index=pd.date_range("1/1/2012", freq="s", periods=1000),
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columns=["A", "B", "C"],
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)
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result = df.resample("3min").agg(
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{"A": [partial(np.quantile, q=0.9999), partial(np.quantile, q=0.1111)]}
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)
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expected_index = pd.date_range("1/1/2012", freq="3min", periods=6)
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expected_columns = MultiIndex.from_tuples([("A", "quantile"), ("A", "quantile")])
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expected_values = np.array(
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[df.resample("3min").A.quantile(q=q).values for q in [0.9999, 0.1111]]
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).T
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expected = DataFrame(
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expected_values, columns=expected_columns, index=expected_index
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)
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tm.assert_frame_equal(result, expected)
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|
|
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def test_agg_multiple_functions_same_name_with_ohlc_present():
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# GH 30880
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|
# ohlc expands dimensions, so different test to the above is required.
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df = DataFrame(
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np.random.default_rng(2).standard_normal((1000, 3)),
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|
index=pd.date_range("1/1/2012", freq="s", periods=1000, name="dti"),
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|
columns=Index(["A", "B", "C"], name="alpha"),
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|
)
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|
result = df.resample("3min").agg(
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{"A": ["ohlc", partial(np.quantile, q=0.9999), partial(np.quantile, q=0.1111)]}
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)
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|
expected_index = pd.date_range("1/1/2012", freq="3min", periods=6, name="dti")
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|
expected_columns = MultiIndex.from_tuples(
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[
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("A", "ohlc", "open"),
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|
("A", "ohlc", "high"),
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|
("A", "ohlc", "low"),
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|
("A", "ohlc", "close"),
|
|
("A", "quantile", "A"),
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|
("A", "quantile", "A"),
|
|
],
|
|
names=["alpha", None, None],
|
|
)
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|
non_ohlc_expected_values = np.array(
|
|
[df.resample("3min").A.quantile(q=q).values for q in [0.9999, 0.1111]]
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|
).T
|
|
expected_values = np.hstack(
|
|
[df.resample("3min").A.ohlc(), non_ohlc_expected_values]
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|
)
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|
expected = DataFrame(
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|
expected_values, columns=expected_columns, index=expected_index
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|
)
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|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_multiple_functions_tuples_and_non_tuples(df):
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|
# #1359
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|
# Columns B and C would cause partial failure
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|
df = df.drop(columns=["B", "C"])
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|
|
|
funcs = [("foo", "mean"), "std"]
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|
ex_funcs = [("foo", "mean"), ("std", "std")]
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|
|
|
result = df.groupby("A")["D"].agg(funcs)
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|
expected = df.groupby("A")["D"].agg(ex_funcs)
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|
tm.assert_frame_equal(result, expected)
|
|
|
|
result = df.groupby("A").agg(funcs)
|
|
expected = df.groupby("A").agg(ex_funcs)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_more_flexible_frame_multi_function(df):
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|
grouped = df.groupby("A")
|
|
|
|
exmean = grouped.agg({"C": "mean", "D": "mean"})
|
|
exstd = grouped.agg({"C": "std", "D": "std"})
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|
|
|
expected = concat([exmean, exstd], keys=["mean", "std"], axis=1)
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|
expected = expected.swaplevel(0, 1, axis=1).sort_index(level=0, axis=1)
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|
|
|
d = {"C": ["mean", "std"], "D": ["mean", "std"]}
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|
result = grouped.aggregate(d)
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|
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
# be careful
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|
result = grouped.aggregate({"C": "mean", "D": ["mean", "std"]})
|
|
expected = grouped.aggregate({"C": "mean", "D": ["mean", "std"]})
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
def numpymean(x):
|
|
return np.mean(x)
|
|
|
|
def numpystd(x):
|
|
return np.std(x, ddof=1)
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|
|
|
# this uses column selection & renaming
|
|
msg = r"nested renamer is not supported"
|
|
with pytest.raises(SpecificationError, match=msg):
|
|
d = {"C": "mean", "D": {"foo": "mean", "bar": "std"}}
|
|
grouped.aggregate(d)
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|
|
|
# But without renaming, these functions are OK
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|
d = {"C": ["mean"], "D": [numpymean, numpystd]}
|
|
grouped.aggregate(d)
|
|
|
|
|
|
def test_multi_function_flexible_mix(df):
|
|
# GH #1268
|
|
grouped = df.groupby("A")
|
|
|
|
# Expected
|
|
d = {"C": {"foo": "mean", "bar": "std"}, "D": {"sum": "sum"}}
|
|
# this uses column selection & renaming
|
|
msg = r"nested renamer is not supported"
|
|
with pytest.raises(SpecificationError, match=msg):
|
|
grouped.aggregate(d)
|
|
|
|
# Test 1
|
|
d = {"C": {"foo": "mean", "bar": "std"}, "D": "sum"}
|
|
# this uses column selection & renaming
|
|
with pytest.raises(SpecificationError, match=msg):
|
|
grouped.aggregate(d)
|
|
|
|
# Test 2
|
|
d = {"C": {"foo": "mean", "bar": "std"}, "D": "sum"}
|
|
# this uses column selection & renaming
|
|
with pytest.raises(SpecificationError, match=msg):
|
|
grouped.aggregate(d)
|
|
|
|
|
|
def test_groupby_agg_coercing_bools():
|
|
# issue 14873
|
|
dat = DataFrame({"a": [1, 1, 2, 2], "b": [0, 1, 2, 3], "c": [None, None, 1, 1]})
|
|
gp = dat.groupby("a")
|
|
|
|
index = Index([1, 2], name="a")
|
|
|
|
result = gp["b"].aggregate(lambda x: (x != 0).all())
|
|
expected = Series([False, True], index=index, name="b")
|
|
tm.assert_series_equal(result, expected)
|
|
|
|
result = gp["c"].aggregate(lambda x: x.isnull().all())
|
|
expected = Series([True, False], index=index, name="c")
|
|
tm.assert_series_equal(result, expected)
|
|
|
|
|
|
def test_groupby_agg_dict_with_getitem():
|
|
# issue 25471
|
|
dat = DataFrame({"A": ["A", "A", "B", "B", "B"], "B": [1, 2, 1, 1, 2]})
|
|
result = dat.groupby("A")[["B"]].agg({"B": "sum"})
|
|
|
|
expected = DataFrame({"B": [3, 4]}, index=["A", "B"]).rename_axis("A", axis=0)
|
|
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_groupby_agg_dict_dup_columns():
|
|
# GH#55006
|
|
df = DataFrame(
|
|
[[1, 2, 3, 4], [1, 3, 4, 5], [2, 4, 5, 6]],
|
|
columns=["a", "b", "c", "c"],
|
|
)
|
|
gb = df.groupby("a")
|
|
result = gb.agg({"b": "sum"})
|
|
expected = DataFrame({"b": [5, 4]}, index=Index([1, 2], name="a"))
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"op",
|
|
[
|
|
lambda x: x.sum(),
|
|
lambda x: x.cumsum(),
|
|
lambda x: x.transform("sum"),
|
|
lambda x: x.transform("cumsum"),
|
|
lambda x: x.agg("sum"),
|
|
lambda x: x.agg("cumsum"),
|
|
],
|
|
)
|
|
def test_bool_agg_dtype(op):
|
|
# GH 7001
|
|
# Bool sum aggregations result in int
|
|
df = DataFrame({"a": [1, 1], "b": [False, True]})
|
|
s = df.set_index("a")["b"]
|
|
|
|
result = op(df.groupby("a"))["b"].dtype
|
|
assert is_integer_dtype(result)
|
|
|
|
result = op(s.groupby("a")).dtype
|
|
assert is_integer_dtype(result)
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"keys, agg_index",
|
|
[
|
|
(["a"], Index([1], name="a")),
|
|
(["a", "b"], MultiIndex([[1], [2]], [[0], [0]], names=["a", "b"])),
|
|
],
|
|
)
|
|
@pytest.mark.parametrize(
|
|
"input_dtype", ["bool", "int32", "int64", "float32", "float64"]
|
|
)
|
|
@pytest.mark.parametrize(
|
|
"result_dtype", ["bool", "int32", "int64", "float32", "float64"]
|
|
)
|
|
@pytest.mark.parametrize("method", ["apply", "aggregate", "transform"])
|
|
def test_callable_result_dtype_frame(
|
|
keys, agg_index, input_dtype, result_dtype, method
|
|
):
|
|
# GH 21240
|
|
df = DataFrame({"a": [1], "b": [2], "c": [True]})
|
|
df["c"] = df["c"].astype(input_dtype)
|
|
op = getattr(df.groupby(keys)[["c"]], method)
|
|
result = op(lambda x: x.astype(result_dtype).iloc[0])
|
|
expected_index = pd.RangeIndex(0, 1) if method == "transform" else agg_index
|
|
expected = DataFrame({"c": [df["c"].iloc[0]]}, index=expected_index).astype(
|
|
result_dtype
|
|
)
|
|
if method == "apply":
|
|
expected.columns.names = [0]
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"keys, agg_index",
|
|
[
|
|
(["a"], Index([1], name="a")),
|
|
(["a", "b"], MultiIndex([[1], [2]], [[0], [0]], names=["a", "b"])),
|
|
],
|
|
)
|
|
@pytest.mark.parametrize("input", [True, 1, 1.0])
|
|
@pytest.mark.parametrize("dtype", [bool, int, float])
|
|
@pytest.mark.parametrize("method", ["apply", "aggregate", "transform"])
|
|
def test_callable_result_dtype_series(keys, agg_index, input, dtype, method):
|
|
# GH 21240
|
|
df = DataFrame({"a": [1], "b": [2], "c": [input]})
|
|
op = getattr(df.groupby(keys)["c"], method)
|
|
result = op(lambda x: x.astype(dtype).iloc[0])
|
|
expected_index = pd.RangeIndex(0, 1) if method == "transform" else agg_index
|
|
expected = Series([df["c"].iloc[0]], index=expected_index, name="c").astype(dtype)
|
|
tm.assert_series_equal(result, expected)
|
|
|
|
|
|
def test_order_aggregate_multiple_funcs():
|
|
# GH 25692
|
|
df = DataFrame({"A": [1, 1, 2, 2], "B": [1, 2, 3, 4]})
|
|
|
|
res = df.groupby("A").agg(["sum", "max", "mean", "ohlc", "min"])
|
|
result = res.columns.levels[1]
|
|
|
|
expected = Index(["sum", "max", "mean", "ohlc", "min"])
|
|
|
|
tm.assert_index_equal(result, expected)
|
|
|
|
|
|
def test_ohlc_ea_dtypes(any_numeric_ea_dtype):
|
|
# GH#37493
|
|
df = DataFrame(
|
|
{"a": [1, 1, 2, 3, 4, 4], "b": [22, 11, pd.NA, 10, 20, pd.NA]},
|
|
dtype=any_numeric_ea_dtype,
|
|
)
|
|
gb = df.groupby("a")
|
|
result = gb.ohlc()
|
|
expected = DataFrame(
|
|
[[22, 22, 11, 11], [pd.NA] * 4, [10] * 4, [20] * 4],
|
|
columns=MultiIndex.from_product([["b"], ["open", "high", "low", "close"]]),
|
|
index=Index([1, 2, 3, 4], dtype=any_numeric_ea_dtype, name="a"),
|
|
dtype=any_numeric_ea_dtype,
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
gb2 = df.groupby("a", as_index=False)
|
|
result2 = gb2.ohlc()
|
|
expected2 = expected.reset_index()
|
|
tm.assert_frame_equal(result2, expected2)
|
|
|
|
|
|
@pytest.mark.parametrize("dtype", [np.int64, np.uint64])
|
|
@pytest.mark.parametrize("how", ["first", "last", "min", "max", "mean", "median"])
|
|
def test_uint64_type_handling(dtype, how):
|
|
# GH 26310
|
|
df = DataFrame({"x": 6903052872240755750, "y": [1, 2]})
|
|
expected = df.groupby("y").agg({"x": how})
|
|
df.x = df.x.astype(dtype)
|
|
result = df.groupby("y").agg({"x": how})
|
|
if how not in ("mean", "median"):
|
|
# mean and median always result in floats
|
|
result.x = result.x.astype(np.int64)
|
|
tm.assert_frame_equal(result, expected, check_exact=True)
|
|
|
|
|
|
def test_func_duplicates_raises():
|
|
# GH28426
|
|
msg = "Function names"
|
|
df = DataFrame({"A": [0, 0, 1, 1], "B": [1, 2, 3, 4]})
|
|
with pytest.raises(SpecificationError, match=msg):
|
|
df.groupby("A").agg(["min", "min"])
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"index",
|
|
[
|
|
pd.CategoricalIndex(list("abc")),
|
|
pd.interval_range(0, 3),
|
|
pd.period_range("2020", periods=3, freq="D"),
|
|
MultiIndex.from_tuples([("a", 0), ("a", 1), ("b", 0)]),
|
|
],
|
|
)
|
|
def test_agg_index_has_complex_internals(index):
|
|
# GH 31223
|
|
df = DataFrame({"group": [1, 1, 2], "value": [0, 1, 0]}, index=index)
|
|
result = df.groupby("group").agg({"value": Series.nunique})
|
|
expected = DataFrame({"group": [1, 2], "value": [2, 1]}).set_index("group")
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_agg_split_block():
|
|
# https://github.com/pandas-dev/pandas/issues/31522
|
|
df = DataFrame(
|
|
{
|
|
"key1": ["a", "a", "b", "b", "a"],
|
|
"key2": ["one", "two", "one", "two", "one"],
|
|
"key3": ["three", "three", "three", "six", "six"],
|
|
}
|
|
)
|
|
result = df.groupby("key1").min()
|
|
expected = DataFrame(
|
|
{"key2": ["one", "one"], "key3": ["six", "six"]},
|
|
index=Index(["a", "b"], name="key1"),
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_agg_split_object_part_datetime():
|
|
# https://github.com/pandas-dev/pandas/pull/31616
|
|
df = DataFrame(
|
|
{
|
|
"A": pd.date_range("2000", periods=4),
|
|
"B": ["a", "b", "c", "d"],
|
|
"C": [1, 2, 3, 4],
|
|
"D": ["b", "c", "d", "e"],
|
|
"E": pd.date_range("2000", periods=4),
|
|
"F": [1, 2, 3, 4],
|
|
}
|
|
).astype(object)
|
|
result = df.groupby([0, 0, 0, 0]).min()
|
|
expected = DataFrame(
|
|
{
|
|
"A": [pd.Timestamp("2000")],
|
|
"B": ["a"],
|
|
"C": [1],
|
|
"D": ["b"],
|
|
"E": [pd.Timestamp("2000")],
|
|
"F": [1],
|
|
},
|
|
index=np.array([0]),
|
|
dtype=object,
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
class TestNamedAggregationSeries:
|
|
def test_series_named_agg(self):
|
|
df = Series([1, 2, 3, 4])
|
|
gr = df.groupby([0, 0, 1, 1])
|
|
result = gr.agg(a="sum", b="min")
|
|
expected = DataFrame(
|
|
{"a": [3, 7], "b": [1, 3]}, columns=["a", "b"], index=np.array([0, 1])
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
result = gr.agg(b="min", a="sum")
|
|
expected = expected[["b", "a"]]
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
def test_no_args_raises(self):
|
|
gr = Series([1, 2]).groupby([0, 1])
|
|
with pytest.raises(TypeError, match="Must provide"):
|
|
gr.agg()
|
|
|
|
# but we do allow this
|
|
result = gr.agg([])
|
|
expected = DataFrame(columns=[])
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
def test_series_named_agg_duplicates_no_raises(self):
|
|
# GH28426
|
|
gr = Series([1, 2, 3]).groupby([0, 0, 1])
|
|
grouped = gr.agg(a="sum", b="sum")
|
|
expected = DataFrame({"a": [3, 3], "b": [3, 3]}, index=np.array([0, 1]))
|
|
tm.assert_frame_equal(expected, grouped)
|
|
|
|
def test_mangled(self):
|
|
gr = Series([1, 2, 3]).groupby([0, 0, 1])
|
|
result = gr.agg(a=lambda x: 0, b=lambda x: 1)
|
|
expected = DataFrame({"a": [0, 0], "b": [1, 1]}, index=np.array([0, 1]))
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
@pytest.mark.parametrize(
|
|
"inp",
|
|
[
|
|
pd.NamedAgg(column="anything", aggfunc="min"),
|
|
("anything", "min"),
|
|
["anything", "min"],
|
|
],
|
|
)
|
|
def test_named_agg_nametuple(self, inp):
|
|
# GH34422
|
|
s = Series([1, 1, 2, 2, 3, 3, 4, 5])
|
|
msg = f"func is expected but received {type(inp).__name__}"
|
|
with pytest.raises(TypeError, match=msg):
|
|
s.groupby(s.values).agg(a=inp)
|
|
|
|
|
|
class TestNamedAggregationDataFrame:
|
|
def test_agg_relabel(self):
|
|
df = DataFrame(
|
|
{"group": ["a", "a", "b", "b"], "A": [0, 1, 2, 3], "B": [5, 6, 7, 8]}
|
|
)
|
|
result = df.groupby("group").agg(a_max=("A", "max"), b_max=("B", "max"))
|
|
expected = DataFrame(
|
|
{"a_max": [1, 3], "b_max": [6, 8]},
|
|
index=Index(["a", "b"], name="group"),
|
|
columns=["a_max", "b_max"],
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
# order invariance
|
|
p98 = functools.partial(np.percentile, q=98)
|
|
result = df.groupby("group").agg(
|
|
b_min=("B", "min"),
|
|
a_min=("A", "min"),
|
|
a_mean=("A", "mean"),
|
|
a_max=("A", "max"),
|
|
b_max=("B", "max"),
|
|
a_98=("A", p98),
|
|
)
|
|
expected = DataFrame(
|
|
{
|
|
"b_min": [5, 7],
|
|
"a_min": [0, 2],
|
|
"a_mean": [0.5, 2.5],
|
|
"a_max": [1, 3],
|
|
"b_max": [6, 8],
|
|
"a_98": [0.98, 2.98],
|
|
},
|
|
index=Index(["a", "b"], name="group"),
|
|
columns=["b_min", "a_min", "a_mean", "a_max", "b_max", "a_98"],
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
def test_agg_relabel_non_identifier(self):
|
|
df = DataFrame(
|
|
{"group": ["a", "a", "b", "b"], "A": [0, 1, 2, 3], "B": [5, 6, 7, 8]}
|
|
)
|
|
|
|
result = df.groupby("group").agg(**{"my col": ("A", "max")})
|
|
expected = DataFrame({"my col": [1, 3]}, index=Index(["a", "b"], name="group"))
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
def test_duplicate_no_raises(self):
|
|
# GH 28426, if use same input function on same column,
|
|
# no error should raise
|
|
df = DataFrame({"A": [0, 0, 1, 1], "B": [1, 2, 3, 4]})
|
|
|
|
grouped = df.groupby("A").agg(a=("B", "min"), b=("B", "min"))
|
|
expected = DataFrame({"a": [1, 3], "b": [1, 3]}, index=Index([0, 1], name="A"))
|
|
tm.assert_frame_equal(grouped, expected)
|
|
|
|
quant50 = functools.partial(np.percentile, q=50)
|
|
quant70 = functools.partial(np.percentile, q=70)
|
|
quant50.__name__ = "quant50"
|
|
quant70.__name__ = "quant70"
|
|
|
|
test = DataFrame({"col1": ["a", "a", "b", "b", "b"], "col2": [1, 2, 3, 4, 5]})
|
|
|
|
grouped = test.groupby("col1").agg(
|
|
quantile_50=("col2", quant50), quantile_70=("col2", quant70)
|
|
)
|
|
expected = DataFrame(
|
|
{"quantile_50": [1.5, 4.0], "quantile_70": [1.7, 4.4]},
|
|
index=Index(["a", "b"], name="col1"),
|
|
)
|
|
tm.assert_frame_equal(grouped, expected)
|
|
|
|
def test_agg_relabel_with_level(self):
|
|
df = DataFrame(
|
|
{"A": [0, 0, 1, 1], "B": [1, 2, 3, 4]},
|
|
index=MultiIndex.from_product([["A", "B"], ["a", "b"]]),
|
|
)
|
|
result = df.groupby(level=0).agg(
|
|
aa=("A", "max"), bb=("A", "min"), cc=("B", "mean")
|
|
)
|
|
expected = DataFrame(
|
|
{"aa": [0, 1], "bb": [0, 1], "cc": [1.5, 3.5]}, index=["A", "B"]
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
def test_agg_relabel_other_raises(self):
|
|
df = DataFrame({"A": [0, 0, 1], "B": [1, 2, 3]})
|
|
grouped = df.groupby("A")
|
|
match = "Must provide"
|
|
with pytest.raises(TypeError, match=match):
|
|
grouped.agg(foo=1)
|
|
|
|
with pytest.raises(TypeError, match=match):
|
|
grouped.agg()
|
|
|
|
with pytest.raises(TypeError, match=match):
|
|
grouped.agg(a=("B", "max"), b=(1, 2, 3))
|
|
|
|
def test_missing_raises(self):
|
|
df = DataFrame({"A": [0, 1], "B": [1, 2]})
|
|
match = re.escape("Column(s) ['C'] do not exist")
|
|
with pytest.raises(KeyError, match=match):
|
|
df.groupby("A").agg(c=("C", "sum"))
|
|
|
|
def test_agg_namedtuple(self):
|
|
df = DataFrame({"A": [0, 1], "B": [1, 2]})
|
|
result = df.groupby("A").agg(
|
|
b=pd.NamedAgg("B", "sum"), c=pd.NamedAgg(column="B", aggfunc="count")
|
|
)
|
|
expected = df.groupby("A").agg(b=("B", "sum"), c=("B", "count"))
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
def test_mangled(self):
|
|
df = DataFrame({"A": [0, 1], "B": [1, 2], "C": [3, 4]})
|
|
result = df.groupby("A").agg(b=("B", lambda x: 0), c=("C", lambda x: 1))
|
|
expected = DataFrame({"b": [0, 0], "c": [1, 1]}, index=Index([0, 1], name="A"))
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"agg_col1, agg_col2, agg_col3, agg_result1, agg_result2, agg_result3",
|
|
[
|
|
(
|
|
(("y", "A"), "max"),
|
|
(("y", "A"), np.mean),
|
|
(("y", "B"), "mean"),
|
|
[1, 3],
|
|
[0.5, 2.5],
|
|
[5.5, 7.5],
|
|
),
|
|
(
|
|
(("y", "A"), lambda x: max(x)),
|
|
(("y", "A"), lambda x: 1),
|
|
(("y", "B"), np.mean),
|
|
[1, 3],
|
|
[1, 1],
|
|
[5.5, 7.5],
|
|
),
|
|
(
|
|
pd.NamedAgg(("y", "A"), "max"),
|
|
pd.NamedAgg(("y", "B"), np.mean),
|
|
pd.NamedAgg(("y", "A"), lambda x: 1),
|
|
[1, 3],
|
|
[5.5, 7.5],
|
|
[1, 1],
|
|
),
|
|
],
|
|
)
|
|
def test_agg_relabel_multiindex_column(
|
|
agg_col1, agg_col2, agg_col3, agg_result1, agg_result2, agg_result3
|
|
):
|
|
# GH 29422, add tests for multiindex column cases
|
|
df = DataFrame(
|
|
{"group": ["a", "a", "b", "b"], "A": [0, 1, 2, 3], "B": [5, 6, 7, 8]}
|
|
)
|
|
df.columns = MultiIndex.from_tuples([("x", "group"), ("y", "A"), ("y", "B")])
|
|
idx = Index(["a", "b"], name=("x", "group"))
|
|
|
|
result = df.groupby(("x", "group")).agg(a_max=(("y", "A"), "max"))
|
|
expected = DataFrame({"a_max": [1, 3]}, index=idx)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
msg = "is currently using SeriesGroupBy.mean"
|
|
with tm.assert_produces_warning(FutureWarning, match=msg):
|
|
result = df.groupby(("x", "group")).agg(
|
|
col_1=agg_col1, col_2=agg_col2, col_3=agg_col3
|
|
)
|
|
expected = DataFrame(
|
|
{"col_1": agg_result1, "col_2": agg_result2, "col_3": agg_result3}, index=idx
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_agg_relabel_multiindex_raises_not_exist():
|
|
# GH 29422, add test for raises scenario when aggregate column does not exist
|
|
df = DataFrame(
|
|
{"group": ["a", "a", "b", "b"], "A": [0, 1, 2, 3], "B": [5, 6, 7, 8]}
|
|
)
|
|
df.columns = MultiIndex.from_tuples([("x", "group"), ("y", "A"), ("y", "B")])
|
|
|
|
with pytest.raises(KeyError, match="do not exist"):
|
|
df.groupby(("x", "group")).agg(a=(("Y", "a"), "max"))
|
|
|
|
|
|
def test_agg_relabel_multiindex_duplicates():
|
|
# GH29422, add test for raises scenario when getting duplicates
|
|
# GH28426, after this change, duplicates should also work if the relabelling is
|
|
# different
|
|
df = DataFrame(
|
|
{"group": ["a", "a", "b", "b"], "A": [0, 1, 2, 3], "B": [5, 6, 7, 8]}
|
|
)
|
|
df.columns = MultiIndex.from_tuples([("x", "group"), ("y", "A"), ("y", "B")])
|
|
|
|
result = df.groupby(("x", "group")).agg(
|
|
a=(("y", "A"), "min"), b=(("y", "A"), "min")
|
|
)
|
|
idx = Index(["a", "b"], name=("x", "group"))
|
|
expected = DataFrame({"a": [0, 2], "b": [0, 2]}, index=idx)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
@pytest.mark.parametrize("kwargs", [{"c": ["min"]}, {"b": [], "c": ["min"]}])
|
|
def test_groupby_aggregate_empty_key(kwargs):
|
|
# GH: 32580
|
|
df = DataFrame({"a": [1, 1, 2], "b": [1, 2, 3], "c": [1, 2, 4]})
|
|
result = df.groupby("a").agg(kwargs)
|
|
expected = DataFrame(
|
|
[1, 4],
|
|
index=Index([1, 2], dtype="int64", name="a"),
|
|
columns=MultiIndex.from_tuples([["c", "min"]]),
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_groupby_aggregate_empty_key_empty_return():
|
|
# GH: 32580 Check if everything works, when return is empty
|
|
df = DataFrame({"a": [1, 1, 2], "b": [1, 2, 3], "c": [1, 2, 4]})
|
|
result = df.groupby("a").agg({"b": []})
|
|
expected = DataFrame(columns=MultiIndex(levels=[["b"], []], codes=[[], []]))
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_groupby_aggregate_empty_with_multiindex_frame():
|
|
# GH 39178
|
|
df = DataFrame(columns=["a", "b", "c"])
|
|
result = df.groupby(["a", "b"], group_keys=False).agg(d=("c", list))
|
|
expected = DataFrame(
|
|
columns=["d"], index=MultiIndex([[], []], [[], []], names=["a", "b"])
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_grouby_agg_loses_results_with_as_index_false_relabel():
|
|
# GH 32240: When the aggregate function relabels column names and
|
|
# as_index=False is specified, the results are dropped.
|
|
|
|
df = DataFrame(
|
|
{"key": ["x", "y", "z", "x", "y", "z"], "val": [1.0, 0.8, 2.0, 3.0, 3.6, 0.75]}
|
|
)
|
|
|
|
grouped = df.groupby("key", as_index=False)
|
|
result = grouped.agg(min_val=pd.NamedAgg(column="val", aggfunc="min"))
|
|
expected = DataFrame({"key": ["x", "y", "z"], "min_val": [1.0, 0.8, 0.75]})
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_grouby_agg_loses_results_with_as_index_false_relabel_multiindex():
|
|
# GH 32240: When the aggregate function relabels column names and
|
|
# as_index=False is specified, the results are dropped. Check if
|
|
# multiindex is returned in the right order
|
|
|
|
df = DataFrame(
|
|
{
|
|
"key": ["x", "y", "x", "y", "x", "x"],
|
|
"key1": ["a", "b", "c", "b", "a", "c"],
|
|
"val": [1.0, 0.8, 2.0, 3.0, 3.6, 0.75],
|
|
}
|
|
)
|
|
|
|
grouped = df.groupby(["key", "key1"], as_index=False)
|
|
result = grouped.agg(min_val=pd.NamedAgg(column="val", aggfunc="min"))
|
|
expected = DataFrame(
|
|
{"key": ["x", "x", "y"], "key1": ["a", "c", "b"], "min_val": [1.0, 0.75, 0.8]}
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"func", [lambda s: s.mean(), lambda s: np.mean(s), lambda s: np.nanmean(s)]
|
|
)
|
|
def test_multiindex_custom_func(func):
|
|
# GH 31777
|
|
data = [[1, 4, 2], [5, 7, 1]]
|
|
df = DataFrame(
|
|
data,
|
|
columns=MultiIndex.from_arrays(
|
|
[[1, 1, 2], [3, 4, 3]], names=["Sisko", "Janeway"]
|
|
),
|
|
)
|
|
result = df.groupby(np.array([0, 1])).agg(func)
|
|
expected_dict = {
|
|
(1, 3): {0: 1.0, 1: 5.0},
|
|
(1, 4): {0: 4.0, 1: 7.0},
|
|
(2, 3): {0: 2.0, 1: 1.0},
|
|
}
|
|
expected = DataFrame(expected_dict, index=np.array([0, 1]), columns=df.columns)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def myfunc(s):
|
|
return np.percentile(s, q=0.90)
|
|
|
|
|
|
@pytest.mark.parametrize("func", [lambda s: np.percentile(s, q=0.90), myfunc])
|
|
def test_lambda_named_agg(func):
|
|
# see gh-28467
|
|
animals = DataFrame(
|
|
{
|
|
"kind": ["cat", "dog", "cat", "dog"],
|
|
"height": [9.1, 6.0, 9.5, 34.0],
|
|
"weight": [7.9, 7.5, 9.9, 198.0],
|
|
}
|
|
)
|
|
|
|
result = animals.groupby("kind").agg(
|
|
mean_height=("height", "mean"), perc90=("height", func)
|
|
)
|
|
expected = DataFrame(
|
|
[[9.3, 9.1036], [20.0, 6.252]],
|
|
columns=["mean_height", "perc90"],
|
|
index=Index(["cat", "dog"], name="kind"),
|
|
)
|
|
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_aggregate_mixed_types():
|
|
# GH 16916
|
|
df = DataFrame(
|
|
data=np.array([0] * 9).reshape(3, 3), columns=list("XYZ"), index=list("abc")
|
|
)
|
|
df["grouping"] = ["group 1", "group 1", 2]
|
|
result = df.groupby("grouping").aggregate(lambda x: x.tolist())
|
|
expected_data = [[[0], [0], [0]], [[0, 0], [0, 0], [0, 0]]]
|
|
expected = DataFrame(
|
|
expected_data,
|
|
index=Index([2, "group 1"], dtype="object", name="grouping"),
|
|
columns=Index(["X", "Y", "Z"], dtype="object"),
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
@pytest.mark.xfail(reason="Not implemented;see GH 31256")
|
|
def test_aggregate_udf_na_extension_type():
|
|
# https://github.com/pandas-dev/pandas/pull/31359
|
|
# This is currently failing to cast back to Int64Dtype.
|
|
# The presence of the NA causes two problems
|
|
# 1. NA is not an instance of Int64Dtype.type (numpy.int64)
|
|
# 2. The presence of an NA forces object type, so the non-NA values is
|
|
# a Python int rather than a NumPy int64. Python ints aren't
|
|
# instances of numpy.int64.
|
|
def aggfunc(x):
|
|
if all(x > 2):
|
|
return 1
|
|
else:
|
|
return pd.NA
|
|
|
|
df = DataFrame({"A": pd.array([1, 2, 3])})
|
|
result = df.groupby([1, 1, 2]).agg(aggfunc)
|
|
expected = DataFrame({"A": pd.array([1, pd.NA], dtype="Int64")}, index=[1, 2])
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
class TestLambdaMangling:
|
|
def test_basic(self):
|
|
df = DataFrame({"A": [0, 0, 1, 1], "B": [1, 2, 3, 4]})
|
|
result = df.groupby("A").agg({"B": [lambda x: 0, lambda x: 1]})
|
|
|
|
expected = DataFrame(
|
|
{("B", "<lambda_0>"): [0, 0], ("B", "<lambda_1>"): [1, 1]},
|
|
index=Index([0, 1], name="A"),
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
def test_mangle_series_groupby(self):
|
|
gr = Series([1, 2, 3, 4]).groupby([0, 0, 1, 1])
|
|
result = gr.agg([lambda x: 0, lambda x: 1])
|
|
exp_data = {"<lambda_0>": [0, 0], "<lambda_1>": [1, 1]}
|
|
expected = DataFrame(exp_data, index=np.array([0, 1]))
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
@pytest.mark.xfail(reason="GH-26611. kwargs for multi-agg.")
|
|
def test_with_kwargs(self):
|
|
f1 = lambda x, y, b=1: x.sum() + y + b
|
|
f2 = lambda x, y, b=2: x.sum() + y * b
|
|
result = Series([1, 2]).groupby([0, 0]).agg([f1, f2], 0)
|
|
expected = DataFrame({"<lambda_0>": [4], "<lambda_1>": [6]})
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
result = Series([1, 2]).groupby([0, 0]).agg([f1, f2], 0, b=10)
|
|
expected = DataFrame({"<lambda_0>": [13], "<lambda_1>": [30]})
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
def test_agg_with_one_lambda(self):
|
|
# GH 25719, write tests for DataFrameGroupby.agg with only one lambda
|
|
df = DataFrame(
|
|
{
|
|
"kind": ["cat", "dog", "cat", "dog"],
|
|
"height": [9.1, 6.0, 9.5, 34.0],
|
|
"weight": [7.9, 7.5, 9.9, 198.0],
|
|
}
|
|
)
|
|
|
|
columns = ["height_sqr_min", "height_max", "weight_max"]
|
|
expected = DataFrame(
|
|
{
|
|
"height_sqr_min": [82.81, 36.00],
|
|
"height_max": [9.5, 34.0],
|
|
"weight_max": [9.9, 198.0],
|
|
},
|
|
index=Index(["cat", "dog"], name="kind"),
|
|
columns=columns,
|
|
)
|
|
|
|
# check pd.NameAgg case
|
|
result1 = df.groupby(by="kind").agg(
|
|
height_sqr_min=pd.NamedAgg(
|
|
column="height", aggfunc=lambda x: np.min(x**2)
|
|
),
|
|
height_max=pd.NamedAgg(column="height", aggfunc="max"),
|
|
weight_max=pd.NamedAgg(column="weight", aggfunc="max"),
|
|
)
|
|
tm.assert_frame_equal(result1, expected)
|
|
|
|
# check agg(key=(col, aggfunc)) case
|
|
result2 = df.groupby(by="kind").agg(
|
|
height_sqr_min=("height", lambda x: np.min(x**2)),
|
|
height_max=("height", "max"),
|
|
weight_max=("weight", "max"),
|
|
)
|
|
tm.assert_frame_equal(result2, expected)
|
|
|
|
def test_agg_multiple_lambda(self):
|
|
# GH25719, test for DataFrameGroupby.agg with multiple lambdas
|
|
# with mixed aggfunc
|
|
df = DataFrame(
|
|
{
|
|
"kind": ["cat", "dog", "cat", "dog"],
|
|
"height": [9.1, 6.0, 9.5, 34.0],
|
|
"weight": [7.9, 7.5, 9.9, 198.0],
|
|
}
|
|
)
|
|
columns = [
|
|
"height_sqr_min",
|
|
"height_max",
|
|
"weight_max",
|
|
"height_max_2",
|
|
"weight_min",
|
|
]
|
|
expected = DataFrame(
|
|
{
|
|
"height_sqr_min": [82.81, 36.00],
|
|
"height_max": [9.5, 34.0],
|
|
"weight_max": [9.9, 198.0],
|
|
"height_max_2": [9.5, 34.0],
|
|
"weight_min": [7.9, 7.5],
|
|
},
|
|
index=Index(["cat", "dog"], name="kind"),
|
|
columns=columns,
|
|
)
|
|
|
|
# check agg(key=(col, aggfunc)) case
|
|
result1 = df.groupby(by="kind").agg(
|
|
height_sqr_min=("height", lambda x: np.min(x**2)),
|
|
height_max=("height", "max"),
|
|
weight_max=("weight", "max"),
|
|
height_max_2=("height", lambda x: np.max(x)),
|
|
weight_min=("weight", lambda x: np.min(x)),
|
|
)
|
|
tm.assert_frame_equal(result1, expected)
|
|
|
|
# check pd.NamedAgg case
|
|
result2 = df.groupby(by="kind").agg(
|
|
height_sqr_min=pd.NamedAgg(
|
|
column="height", aggfunc=lambda x: np.min(x**2)
|
|
),
|
|
height_max=pd.NamedAgg(column="height", aggfunc="max"),
|
|
weight_max=pd.NamedAgg(column="weight", aggfunc="max"),
|
|
height_max_2=pd.NamedAgg(column="height", aggfunc=lambda x: np.max(x)),
|
|
weight_min=pd.NamedAgg(column="weight", aggfunc=lambda x: np.min(x)),
|
|
)
|
|
tm.assert_frame_equal(result2, expected)
|
|
|
|
|
|
def test_groupby_get_by_index():
|
|
# GH 33439
|
|
df = DataFrame({"A": ["S", "W", "W"], "B": [1.0, 1.0, 2.0]})
|
|
res = df.groupby("A").agg({"B": lambda x: x.get(x.index[-1])})
|
|
expected = DataFrame({"A": ["S", "W"], "B": [1.0, 2.0]}).set_index("A")
|
|
tm.assert_frame_equal(res, expected)
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"grp_col_dict, exp_data",
|
|
[
|
|
({"nr": "min", "cat_ord": "min"}, {"nr": [1, 5], "cat_ord": ["a", "c"]}),
|
|
({"cat_ord": "min"}, {"cat_ord": ["a", "c"]}),
|
|
({"nr": "min"}, {"nr": [1, 5]}),
|
|
],
|
|
)
|
|
def test_groupby_single_agg_cat_cols(grp_col_dict, exp_data):
|
|
# test single aggregations on ordered categorical cols GHGH27800
|
|
|
|
# create the result dataframe
|
|
input_df = DataFrame(
|
|
{
|
|
"nr": [1, 2, 3, 4, 5, 6, 7, 8],
|
|
"cat_ord": list("aabbccdd"),
|
|
"cat": list("aaaabbbb"),
|
|
}
|
|
)
|
|
|
|
input_df = input_df.astype({"cat": "category", "cat_ord": "category"})
|
|
input_df["cat_ord"] = input_df["cat_ord"].cat.as_ordered()
|
|
result_df = input_df.groupby("cat", observed=False).agg(grp_col_dict)
|
|
|
|
# create expected dataframe
|
|
cat_index = pd.CategoricalIndex(
|
|
["a", "b"], categories=["a", "b"], ordered=False, name="cat", dtype="category"
|
|
)
|
|
|
|
expected_df = DataFrame(data=exp_data, index=cat_index)
|
|
|
|
if "cat_ord" in expected_df:
|
|
# ordered categorical columns should be preserved
|
|
dtype = input_df["cat_ord"].dtype
|
|
expected_df["cat_ord"] = expected_df["cat_ord"].astype(dtype)
|
|
|
|
tm.assert_frame_equal(result_df, expected_df)
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"grp_col_dict, exp_data",
|
|
[
|
|
({"nr": ["min", "max"], "cat_ord": "min"}, [(1, 4, "a"), (5, 8, "c")]),
|
|
({"nr": "min", "cat_ord": ["min", "max"]}, [(1, "a", "b"), (5, "c", "d")]),
|
|
({"cat_ord": ["min", "max"]}, [("a", "b"), ("c", "d")]),
|
|
],
|
|
)
|
|
def test_groupby_combined_aggs_cat_cols(grp_col_dict, exp_data):
|
|
# test combined aggregations on ordered categorical cols GH27800
|
|
|
|
# create the result dataframe
|
|
input_df = DataFrame(
|
|
{
|
|
"nr": [1, 2, 3, 4, 5, 6, 7, 8],
|
|
"cat_ord": list("aabbccdd"),
|
|
"cat": list("aaaabbbb"),
|
|
}
|
|
)
|
|
|
|
input_df = input_df.astype({"cat": "category", "cat_ord": "category"})
|
|
input_df["cat_ord"] = input_df["cat_ord"].cat.as_ordered()
|
|
result_df = input_df.groupby("cat", observed=False).agg(grp_col_dict)
|
|
|
|
# create expected dataframe
|
|
cat_index = pd.CategoricalIndex(
|
|
["a", "b"], categories=["a", "b"], ordered=False, name="cat", dtype="category"
|
|
)
|
|
|
|
# unpack the grp_col_dict to create the multi-index tuple
|
|
# this tuple will be used to create the expected dataframe index
|
|
multi_index_list = []
|
|
for k, v in grp_col_dict.items():
|
|
if isinstance(v, list):
|
|
multi_index_list.extend([k, value] for value in v)
|
|
else:
|
|
multi_index_list.append([k, v])
|
|
multi_index = MultiIndex.from_tuples(tuple(multi_index_list))
|
|
|
|
expected_df = DataFrame(data=exp_data, columns=multi_index, index=cat_index)
|
|
for col in expected_df.columns:
|
|
if isinstance(col, tuple) and "cat_ord" in col:
|
|
# ordered categorical should be preserved
|
|
expected_df[col] = expected_df[col].astype(input_df["cat_ord"].dtype)
|
|
|
|
tm.assert_frame_equal(result_df, expected_df)
|
|
|
|
|
|
def test_nonagg_agg():
|
|
# GH 35490 - Single/Multiple agg of non-agg function give same results
|
|
# TODO: agg should raise for functions that don't aggregate
|
|
df = DataFrame({"a": [1, 1, 2, 2], "b": [1, 2, 2, 1]})
|
|
g = df.groupby("a")
|
|
|
|
result = g.agg(["cumsum"])
|
|
result.columns = result.columns.droplevel(-1)
|
|
expected = g.agg("cumsum")
|
|
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_aggregate_datetime_objects():
|
|
# https://github.com/pandas-dev/pandas/issues/36003
|
|
# ensure we don't raise an error but keep object dtype for out-of-bounds
|
|
# datetimes
|
|
df = DataFrame(
|
|
{
|
|
"A": ["X", "Y"],
|
|
"B": [
|
|
datetime.datetime(2005, 1, 1, 10, 30, 23, 540000),
|
|
datetime.datetime(3005, 1, 1, 10, 30, 23, 540000),
|
|
],
|
|
}
|
|
)
|
|
result = df.groupby("A").B.max()
|
|
expected = df.set_index("A")["B"]
|
|
tm.assert_series_equal(result, expected)
|
|
|
|
|
|
def test_groupby_index_object_dtype():
|
|
# GH 40014
|
|
df = DataFrame({"c0": ["x", "x", "x"], "c1": ["x", "x", "y"], "p": [0, 1, 2]})
|
|
df.index = df.index.astype("O")
|
|
grouped = df.groupby(["c0", "c1"])
|
|
res = grouped.p.agg(lambda x: all(x > 0))
|
|
# Check that providing a user-defined function in agg()
|
|
# produces the correct index shape when using an object-typed index.
|
|
expected_index = MultiIndex.from_tuples(
|
|
[("x", "x"), ("x", "y")], names=("c0", "c1")
|
|
)
|
|
expected = Series([False, True], index=expected_index, name="p")
|
|
tm.assert_series_equal(res, expected)
|
|
|
|
|
|
def test_timeseries_groupby_agg():
|
|
# GH#43290
|
|
|
|
def func(ser):
|
|
if ser.isna().all():
|
|
return None
|
|
return np.sum(ser)
|
|
|
|
df = DataFrame([1.0], index=[pd.Timestamp("2018-01-16 00:00:00+00:00")])
|
|
res = df.groupby(lambda x: 1).agg(func)
|
|
|
|
expected = DataFrame([[1.0]], index=[1])
|
|
tm.assert_frame_equal(res, expected)
|
|
|
|
|
|
def test_groupby_agg_precision(any_real_numeric_dtype):
|
|
if any_real_numeric_dtype in tm.ALL_INT_NUMPY_DTYPES:
|
|
max_value = np.iinfo(any_real_numeric_dtype).max
|
|
if any_real_numeric_dtype in tm.FLOAT_NUMPY_DTYPES:
|
|
max_value = np.finfo(any_real_numeric_dtype).max
|
|
if any_real_numeric_dtype in tm.FLOAT_EA_DTYPES:
|
|
max_value = np.finfo(any_real_numeric_dtype.lower()).max
|
|
if any_real_numeric_dtype in tm.ALL_INT_EA_DTYPES:
|
|
max_value = np.iinfo(any_real_numeric_dtype.lower()).max
|
|
|
|
df = DataFrame(
|
|
{
|
|
"key1": ["a"],
|
|
"key2": ["b"],
|
|
"key3": pd.array([max_value], dtype=any_real_numeric_dtype),
|
|
}
|
|
)
|
|
arrays = [["a"], ["b"]]
|
|
index = MultiIndex.from_arrays(arrays, names=("key1", "key2"))
|
|
|
|
expected = DataFrame(
|
|
{"key3": pd.array([max_value], dtype=any_real_numeric_dtype)}, index=index
|
|
)
|
|
result = df.groupby(["key1", "key2"]).agg(lambda x: x)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_groupby_aggregate_directory(reduction_func):
|
|
# GH#32793
|
|
if reduction_func in ["corrwith", "nth"]:
|
|
return None
|
|
|
|
obj = DataFrame([[0, 1], [0, np.nan]])
|
|
|
|
result_reduced_series = obj.groupby(0).agg(reduction_func)
|
|
result_reduced_frame = obj.groupby(0).agg({1: reduction_func})
|
|
|
|
if reduction_func in ["size", "ngroup"]:
|
|
# names are different: None / 1
|
|
tm.assert_series_equal(
|
|
result_reduced_series, result_reduced_frame[1], check_names=False
|
|
)
|
|
else:
|
|
tm.assert_frame_equal(result_reduced_series, result_reduced_frame)
|
|
tm.assert_series_equal(
|
|
result_reduced_series.dtypes, result_reduced_frame.dtypes
|
|
)
|
|
|
|
|
|
def test_group_mean_timedelta_nat():
|
|
# GH43132
|
|
data = Series(["1 day", "3 days", "NaT"], dtype="timedelta64[ns]")
|
|
expected = Series(["2 days"], dtype="timedelta64[ns]", index=np.array([0]))
|
|
|
|
result = data.groupby([0, 0, 0]).mean()
|
|
|
|
tm.assert_series_equal(result, expected)
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"input_data, expected_output",
|
|
[
|
|
( # no timezone
|
|
["2021-01-01T00:00", "NaT", "2021-01-01T02:00"],
|
|
["2021-01-01T01:00"],
|
|
),
|
|
( # timezone
|
|
["2021-01-01T00:00-0100", "NaT", "2021-01-01T02:00-0100"],
|
|
["2021-01-01T01:00-0100"],
|
|
),
|
|
],
|
|
)
|
|
def test_group_mean_datetime64_nat(input_data, expected_output):
|
|
# GH43132
|
|
data = to_datetime(Series(input_data))
|
|
expected = to_datetime(Series(expected_output, index=np.array([0])))
|
|
|
|
result = data.groupby([0, 0, 0]).mean()
|
|
tm.assert_series_equal(result, expected)
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"func, output", [("mean", [8 + 18j, 10 + 22j]), ("sum", [40 + 90j, 50 + 110j])]
|
|
)
|
|
def test_groupby_complex(func, output):
|
|
# GH#43701
|
|
data = Series(np.arange(20).reshape(10, 2).dot([1, 2j]))
|
|
result = data.groupby(data.index % 2).agg(func)
|
|
expected = Series(output)
|
|
tm.assert_series_equal(result, expected)
|
|
|
|
|
|
@pytest.mark.parametrize("func", ["min", "max", "var"])
|
|
def test_groupby_complex_raises(func):
|
|
# GH#43701
|
|
data = Series(np.arange(20).reshape(10, 2).dot([1, 2j]))
|
|
msg = "No matching signature found"
|
|
with pytest.raises(TypeError, match=msg):
|
|
data.groupby(data.index % 2).agg(func)
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"func", [["min"], ["mean", "max"], {"b": "sum"}, {"b": "prod", "c": "median"}]
|
|
)
|
|
def test_multi_axis_1_raises(func):
|
|
# GH#46995
|
|
df = DataFrame({"a": [1, 1, 2], "b": [3, 4, 5], "c": [6, 7, 8]})
|
|
msg = "DataFrame.groupby with axis=1 is deprecated"
|
|
with tm.assert_produces_warning(FutureWarning, match=msg):
|
|
gb = df.groupby("a", axis=1)
|
|
with pytest.raises(NotImplementedError, match="axis other than 0 is not supported"):
|
|
gb.agg(func)
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"test, constant",
|
|
[
|
|
([[20, "A"], [20, "B"], [10, "C"]], {0: [10, 20], 1: ["C", ["A", "B"]]}),
|
|
([[20, "A"], [20, "B"], [30, "C"]], {0: [20, 30], 1: [["A", "B"], "C"]}),
|
|
([["a", 1], ["a", 1], ["b", 2], ["b", 3]], {0: ["a", "b"], 1: [1, [2, 3]]}),
|
|
pytest.param(
|
|
[["a", 1], ["a", 2], ["b", 3], ["b", 3]],
|
|
{0: ["a", "b"], 1: [[1, 2], 3]},
|
|
marks=pytest.mark.xfail,
|
|
),
|
|
],
|
|
)
|
|
def test_agg_of_mode_list(test, constant):
|
|
# GH#25581
|
|
df1 = DataFrame(test)
|
|
result = df1.groupby(0).agg(Series.mode)
|
|
# Mode usually only returns 1 value, but can return a list in the case of a tie.
|
|
|
|
expected = DataFrame(constant)
|
|
expected = expected.set_index(0)
|
|
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_dataframe_groupy_agg_list_like_func_with_args():
|
|
# GH#50624
|
|
df = DataFrame({"x": [1, 2, 3], "y": ["a", "b", "c"]})
|
|
gb = df.groupby("y")
|
|
|
|
def foo1(x, a=1, c=0):
|
|
return x.sum() + a + c
|
|
|
|
def foo2(x, b=2, c=0):
|
|
return x.sum() + b + c
|
|
|
|
msg = r"foo1\(\) got an unexpected keyword argument 'b'"
|
|
with pytest.raises(TypeError, match=msg):
|
|
gb.agg([foo1, foo2], 3, b=3, c=4)
|
|
|
|
result = gb.agg([foo1, foo2], 3, c=4)
|
|
expected = DataFrame(
|
|
[[8, 8], [9, 9], [10, 10]],
|
|
index=Index(["a", "b", "c"], name="y"),
|
|
columns=MultiIndex.from_tuples([("x", "foo1"), ("x", "foo2")]),
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_series_groupy_agg_list_like_func_with_args():
|
|
# GH#50624
|
|
s = Series([1, 2, 3])
|
|
sgb = s.groupby(s)
|
|
|
|
def foo1(x, a=1, c=0):
|
|
return x.sum() + a + c
|
|
|
|
def foo2(x, b=2, c=0):
|
|
return x.sum() + b + c
|
|
|
|
msg = r"foo1\(\) got an unexpected keyword argument 'b'"
|
|
with pytest.raises(TypeError, match=msg):
|
|
sgb.agg([foo1, foo2], 3, b=3, c=4)
|
|
|
|
result = sgb.agg([foo1, foo2], 3, c=4)
|
|
expected = DataFrame(
|
|
[[8, 8], [9, 9], [10, 10]], index=Index([1, 2, 3]), columns=["foo1", "foo2"]
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_agg_groupings_selection():
|
|
# GH#51186 - a selected grouping should be in the output of agg
|
|
df = DataFrame({"a": [1, 1, 2], "b": [3, 3, 4], "c": [5, 6, 7]})
|
|
gb = df.groupby(["a", "b"])
|
|
selected_gb = gb[["b", "c"]]
|
|
result = selected_gb.agg(lambda x: x.sum())
|
|
index = MultiIndex(
|
|
levels=[[1, 2], [3, 4]], codes=[[0, 1], [0, 1]], names=["a", "b"]
|
|
)
|
|
expected = DataFrame({"b": [6, 4], "c": [11, 7]}, index=index)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_agg_multiple_with_as_index_false_subset_to_a_single_column():
|
|
# GH#50724
|
|
df = DataFrame({"a": [1, 1, 2], "b": [3, 4, 5]})
|
|
gb = df.groupby("a", as_index=False)["b"]
|
|
result = gb.agg(["sum", "mean"])
|
|
expected = DataFrame({"a": [1, 2], "sum": [7, 5], "mean": [3.5, 5.0]})
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_agg_with_as_index_false_with_list():
|
|
# GH#52849
|
|
df = DataFrame({"a1": [0, 0, 1], "a2": [2, 3, 3], "b": [4, 5, 6]})
|
|
gb = df.groupby(by=["a1", "a2"], as_index=False)
|
|
result = gb.agg(["sum"])
|
|
|
|
expected = DataFrame(
|
|
data=[[0, 2, 4], [0, 3, 5], [1, 3, 6]],
|
|
columns=MultiIndex.from_tuples([("a1", ""), ("a2", ""), ("b", "sum")]),
|
|
)
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_groupby_agg_extension_timedelta_cumsum_with_named_aggregation():
|
|
# GH#41720
|
|
expected = DataFrame(
|
|
{
|
|
"td": {
|
|
0: pd.Timedelta("0 days 01:00:00"),
|
|
1: pd.Timedelta("0 days 01:15:00"),
|
|
2: pd.Timedelta("0 days 01:15:00"),
|
|
}
|
|
}
|
|
)
|
|
df = DataFrame(
|
|
{
|
|
"td": Series(
|
|
["0 days 01:00:00", "0 days 00:15:00", "0 days 01:15:00"],
|
|
dtype="timedelta64[ns]",
|
|
),
|
|
"grps": ["a", "a", "b"],
|
|
}
|
|
)
|
|
gb = df.groupby("grps")
|
|
result = gb.agg(td=("td", "cumsum"))
|
|
tm.assert_frame_equal(result, expected)
|
|
|
|
|
|
def test_groupby_aggregation_empty_group():
|
|
# https://github.com/pandas-dev/pandas/issues/18869
|
|
def func(x):
|
|
if len(x) == 0:
|
|
raise ValueError("length must not be 0")
|
|
return len(x)
|
|
|
|
df = DataFrame(
|
|
{"A": pd.Categorical(["a", "a"], categories=["a", "b", "c"]), "B": [1, 1]}
|
|
)
|
|
msg = "length must not be 0"
|
|
with pytest.raises(ValueError, match=msg):
|
|
df.groupby("A", observed=False).agg(func)
|