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AssertionError no _distutils when running get-pip with Setuptools and USE_DISTUTILS=local #2993

@jaraco

Description

@jaraco

Somehow related: Since setuptools v60 at least on Debian running get-pip.py over an existing pip + setuptools fails, when the Debian python3-distutils package is installed, e.g. as dependency of the Python development headers package:

/usr/local/lib/python3.9/dist-packages/_distutils_hack/__init__.py:24: UserWarning: 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.
  warnings.warn(
/usr/local/lib/python3.9/dist-packages/_distutils_hack/__init__.py:36: UserWarning: Setuptools is replacing distutils.
  warnings.warn("Setuptools is replacing distutils.")
Traceback (most recent call last):
  File "/tmp/DietPi-Software/./get-pip.py", line 27081, in <module>
    main()
  File "/tmp/DietPi-Software/./get-pip.py", line 139, in main
    bootstrap(tmpdir=tmpdir)
  File "/tmp/DietPi-Software/./get-pip.py", line 120, in bootstrap
    args = determine_pip_install_arguments()
  File "/tmp/DietPi-Software/./get-pip.py", line 65, in determine_pip_install_arguments
    import setuptools  # noqa
  File "/usr/local/lib/python3.9/dist-packages/setuptools/__init__.py", line 8, in <module>
    import _distutils_hack.override  # noqa: F401
  File "/usr/local/lib/python3.9/dist-packages/_distutils_hack/override.py", line 1, in <module>
    __import__('_distutils_hack').do_override()
  File "/usr/local/lib/python3.9/dist-packages/_distutils_hack/__init__.py", line 73, in do_override
    ensure_local_distutils()
  File "/usr/local/lib/python3.9/dist-packages/_distutils_hack/__init__.py", line 61, in ensure_local_distutils
    assert '_distutils' in core.__file__, core.__file__
AssertionError: /usr/lib/python3.9/distutils/core.py

This _distutils_hack comes from get-pip.py. Looks like removing any use and detangling distutils from pip in favour of setuptools would solve both issues.

Originally posted by @MichaIng in pypa/pip#10742 (comment)

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