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✏️ Editing: __init__.py

# don't import any costly modules
import sys
import os

is_pypy = '__pypy__' in sys.builtin_module_names

def warn_distutils_present():
    if 'distutils' not in sys.modules:
        return
    if is_pypy and sys.version_info < (3, 7):
        # PyPy for 3.6 unconditionally imports distutils, so bypass the warning
        # https://foss.heptapod.net/pypy/pypy/-/blob/be829135bc0d758997b3566062999ee8b23872b4/lib-python/3/site.py#L250
        return
    import warnings

warnings.warn(
        "Distutils was imported before Setuptools, but importing Setuptools "
        "also replaces the `distutils` module in `sys.modules`. This may lead "
        "to undesirable behaviors or errors. To avoid these issues, avoid "
        "using distutils directly, ensure that setuptools is installed in the "
        "traditional way (e.g. not an editable install), and/or make sure "
        "that setuptools is always imported before distutils."
    )

def clear_distutils():
    if 'distutils' not in sys.modules:
        return
    import warnings

warnings.warn("Setuptools is replacing distutils.")
    mods = [
        name
        for name in sys.modules
        if name == "distutils" or name.startswith("distutils.")
    ]
    for name in mods:
        del sys.modules[name]

def enabled():
    """
    Allow selection of distutils by environment variable.
    """
    which = os.environ.get('SETUPTOOLS_USE_DISTUTILS', 'local')
    return which == 'local'

def ensure_local_distutils():
    import importlib

clear_distutils()

# With the DistutilsMetaFinder in place,
    # perform an import to cause distutils to be
    # loaded from setuptools._distutils. Ref #2906.
    with shim():
        importlib.import_module('distutils')

# check that submodules load as expected
    core = importlib.import_module('distutils.core')
    assert '_distutils' in core.__file__, core.__file__
    assert 'setuptools._distutils.log' not in sys.modules

def do_override():
    """
    Ensure that the local copy of distutils is preferred over stdlib.

See https://github.com/pypa/setuptools/issues/417#issuecomment-392298401
    for more motivation.
    """
    if enabled():
        warn_distutils_present()
        ensure_local_distutils()

class _TrivialRe:
    def __init__(self, *patterns):
        self._patterns = patterns

def match(self, string):
        return all(pat in string for pat in self._patterns)

class DistutilsMetaFinder:
    def find_spec(self, fullname, path, target=None):
        # optimization: only consider top level modules and those
        # found in the CPython test suite.
        if path is not None and not fullname.startswith('test.'):
            return

method_name = 'spec_for_{fullname}'.format(**locals())
        method = getattr(self, method_name, lambda: None)
        return method()

def spec_for_distutils(self):
        if self.is_cpython():
            return

import importlib
        import importlib.abc
        import importlib.util

try:
            mod = importlib.import_module('setuptools._distutils')
        except Exception:
            # There are a couple of cases where setuptools._distutils
            # may not be present:
            # - An older Setuptools without a local distutils is
            #   taking precedence. Ref #2957.
            # - Path manipulation during sitecustomize removes
            #   setuptools from the path but only after the hook
            #   has been loaded. Ref #2980.
            # In either case, fall back to stdlib behavior.
            return

class DistutilsLoader(importlib.abc.Loader):
            def create_module(self, spec):
                mod.__name__ = 'distutils'
                return mod

def exec_module(self, module):
                pass

return importlib.util.spec_from_loader(
            'distutils', DistutilsLoader(), origin=mod.__file__
        )

@staticmethod
    def is_cpython():
        """
        Suppress supplying distutils for CPython (build and tests).
        Ref #2965 and #3007.
        """
        return os.path.isfile('pybuilddir.txt')

def spec_for_pip(self):
        """
        Ensure stdlib distutils when running under pip.
        See pypa/pip#8761 for rationale.
        """
        if self.pip_imported_during_build():
            return
        clear_distutils()
        self.spec_for_distutils = lambda: None

@classmethod
    def pip_imported_during_build(cls):
        """
        Detect if pip is being imported in a build script. Ref #2355.
        """
        import traceback

return any(
            cls.frame_file_is_setup(frame) for frame, line in traceback.walk_stack(None)
        )

@staticmethod
    def frame_file_is_setup(frame):
        """
        Return True if the indicated frame suggests a setup.py file.
        """
        # some frames may not have __file__ (#2940)
        return frame.f_globals.get('__file__', '').endswith('setup.py')

def spec_for_sensitive_tests(self):
        """
        Ensure stdlib distutils when running select tests under CPython.

python/cpython#91169
        """
        clear_distutils()
        self.spec_for_distutils = lambda: None

sensitive_tests = (
        [
            'test.test_distutils',
            'test.test_peg_generator',
            'test.test_importlib',
        ]
        if sys.version_info < (3, 10)
        else [
            'test.test_distutils',
        ]
    )

for name in DistutilsMetaFinder.sensitive_tests:
    setattr(
        DistutilsMetaFinder,
        f'spec_for_{name}',
        DistutilsMetaFinder.spec_for_sensitive_tests,
    )

DISTUTILS_FINDER = DistutilsMetaFinder()

def add_shim():
    DISTUTILS_FINDER in sys.meta_path or insert_shim()

class shim:
    def __enter__(self):
        insert_shim()

def __exit__(self, exc, value, tb):
        remove_shim()

def insert_shim():
    sys.meta_path.insert(0, DISTUTILS_FINDER)

def remove_shim():
    try:
        sys.meta_path.remove(DISTUTILS_FINDER)
    except ValueError:
        pass

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