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71 lines
2.0 KiB
71 lines
2.0 KiB
6 months ago
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import pytest
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from pandas import (
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Index,
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Series,
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date_range,
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)
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import pandas._testing as tm
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class TestSeriesDelItem:
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def test_delitem(self):
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# GH#5542
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# should delete the item inplace
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s = Series(range(5))
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del s[0]
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expected = Series(range(1, 5), index=range(1, 5))
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tm.assert_series_equal(s, expected)
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del s[1]
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expected = Series(range(2, 5), index=range(2, 5))
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tm.assert_series_equal(s, expected)
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# only 1 left, del, add, del
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s = Series(1)
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del s[0]
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tm.assert_series_equal(s, Series(dtype="int64", index=Index([], dtype="int64")))
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s[0] = 1
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tm.assert_series_equal(s, Series(1))
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del s[0]
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tm.assert_series_equal(s, Series(dtype="int64", index=Index([], dtype="int64")))
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def test_delitem_object_index(self, using_infer_string):
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# Index(dtype=object)
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dtype = "string[pyarrow_numpy]" if using_infer_string else object
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s = Series(1, index=Index(["a"], dtype=dtype))
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del s["a"]
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tm.assert_series_equal(s, Series(dtype="int64", index=Index([], dtype=dtype)))
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s["a"] = 1
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tm.assert_series_equal(s, Series(1, index=Index(["a"], dtype=dtype)))
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del s["a"]
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tm.assert_series_equal(s, Series(dtype="int64", index=Index([], dtype=dtype)))
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def test_delitem_missing_key(self):
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# empty
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s = Series(dtype=object)
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with pytest.raises(KeyError, match=r"^0$"):
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del s[0]
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def test_delitem_extension_dtype(self):
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# GH#40386
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# DatetimeTZDtype
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dti = date_range("2016-01-01", periods=3, tz="US/Pacific")
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ser = Series(dti)
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expected = ser[[0, 2]]
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del ser[1]
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assert ser.dtype == dti.dtype
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tm.assert_series_equal(ser, expected)
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# PeriodDtype
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pi = dti.tz_localize(None).to_period("D")
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ser = Series(pi)
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expected = ser[:2]
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del ser[2]
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assert ser.dtype == pi.dtype
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tm.assert_series_equal(ser, expected)
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