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146 lines
3.9 KiB
146 lines
3.9 KiB
"""
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Python 3.X compatibility tools.
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While this file was originally intended for Python 2 -> 3 transition,
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it is now used to create a compatibility layer between different
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minor versions of Python 3.
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While the active version of numpy may not support a given version of python, we
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allow downstream libraries to continue to use these shims for forward
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compatibility with numpy while they transition their code to newer versions of
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Python.
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"""
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__all__ = ['bytes', 'asbytes', 'isfileobj', 'getexception', 'strchar',
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'unicode', 'asunicode', 'asbytes_nested', 'asunicode_nested',
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'asstr', 'open_latin1', 'long', 'basestring', 'sixu',
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'integer_types', 'is_pathlib_path', 'npy_load_module', 'Path',
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'pickle', 'contextlib_nullcontext', 'os_fspath', 'os_PathLike']
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import sys
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import os
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from pathlib import Path
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import io
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try:
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import pickle5 as pickle
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except ImportError:
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import pickle
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long = int
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integer_types = (int,)
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basestring = str
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unicode = str
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bytes = bytes
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def asunicode(s):
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if isinstance(s, bytes):
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return s.decode('latin1')
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return str(s)
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def asbytes(s):
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if isinstance(s, bytes):
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return s
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return str(s).encode('latin1')
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def asstr(s):
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if isinstance(s, bytes):
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return s.decode('latin1')
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return str(s)
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def isfileobj(f):
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if not isinstance(f, (io.FileIO, io.BufferedReader, io.BufferedWriter)):
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return False
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try:
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# BufferedReader/Writer may raise OSError when
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# fetching `fileno()` (e.g. when wrapping BytesIO).
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f.fileno()
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return True
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except OSError:
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return False
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def open_latin1(filename, mode='r'):
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return open(filename, mode=mode, encoding='iso-8859-1')
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def sixu(s):
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return s
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strchar = 'U'
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def getexception():
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return sys.exc_info()[1]
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def asbytes_nested(x):
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if hasattr(x, '__iter__') and not isinstance(x, (bytes, unicode)):
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return [asbytes_nested(y) for y in x]
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else:
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return asbytes(x)
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def asunicode_nested(x):
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if hasattr(x, '__iter__') and not isinstance(x, (bytes, unicode)):
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return [asunicode_nested(y) for y in x]
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else:
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return asunicode(x)
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def is_pathlib_path(obj):
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"""
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Check whether obj is a `pathlib.Path` object.
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Prefer using ``isinstance(obj, os.PathLike)`` instead of this function.
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"""
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return isinstance(obj, Path)
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# from Python 3.7
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class contextlib_nullcontext:
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"""Context manager that does no additional processing.
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Used as a stand-in for a normal context manager, when a particular
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block of code is only sometimes used with a normal context manager:
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cm = optional_cm if condition else nullcontext()
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with cm:
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# Perform operation, using optional_cm if condition is True
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.. note::
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Prefer using `contextlib.nullcontext` instead of this context manager.
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"""
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def __init__(self, enter_result=None):
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self.enter_result = enter_result
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def __enter__(self):
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return self.enter_result
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def __exit__(self, *excinfo):
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pass
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def npy_load_module(name, fn, info=None):
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"""
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Load a module. Uses ``load_module`` which will be deprecated in python
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3.12. An alternative that uses ``exec_module`` is in
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numpy.distutils.misc_util.exec_mod_from_location
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.. versionadded:: 1.11.2
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Parameters
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----------
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name : str
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Full module name.
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fn : str
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Path to module file.
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info : tuple, optional
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Only here for backward compatibility with Python 2.*.
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Returns
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-------
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mod : module
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"""
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# Explicitly lazy import this to avoid paying the cost
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# of importing importlib at startup
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from importlib.machinery import SourceFileLoader
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return SourceFileLoader(name, fn).load_module()
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os_fspath = os.fspath
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os_PathLike = os.PathLike
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