No module named 'distutils' in Py12

[stav]

What's the bug all about?

ModuleNotFoundError: No module named 'distutils'

What snippet/command led to this issue?

$ "pipupgrade"

Logs

Traceback (most recent call last):
  File "venv/bin/pipupgrade", line 5, in <module>
    from pipupgrade.__main__ import main
  File "venv/lib/python3.12/site-packages/pipupgrade/__init__.py", line 23, in <module>
    from pipupgrade.__main__    import main
  File "venv/lib/python3.12/site-packages/pipupgrade/__main__.py", line 5, in <module>
    from   pipupgrade.commands import command as main
  File "venv/lib/python3.12/site-packages/pipupgrade/commands/__init__.py", line 11, in <module>
    from pipupgrade.commands.helper import (
  File "venv/lib/python3.12/site-packages/pipupgrade/commands/helper.py", line 10, in <module>
    from pipupgrade.model               import Registry
  File "venv/lib/python3.12/site-packages/pipupgrade/model/__init__.py", line 3, in <module>
    from pipupgrade.model.package  import Package
  File "venv/lib/python3.12/site-packages/pipupgrade/model/package.py", line 11, in <module>
    from pipupgrade                     import _pip, semver
  File "venv/lib/python3.12/site-packages/pipupgrade/_pip.py", line 58, in <module>
    _PIP_EXECUTABLES = _get_pip_executable(multiple = True)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "venv/lib/python3.12/site-packages/pipupgrade/_pip.py", line 43, in _get_pip_executable
    exec_ = which(pip_)
            ^^^^^^^^^^^
  File "venv/lib/python3.12/site-packages/bpyutils/util/system.py", line 79, in which
    from distutils.spawn import find_executable
ModuleNotFoundError: No module named 'distutils'

[stav]

Installed setuptools:

$ pip install setuptools

Looking in indexes: https://pypi.org/simple, https://packagecloud.io/github/git-lfs/pypi/simple
Collecting setuptools
  Downloading setuptools-75.7.0-py3-none-any.whl.metadata (6.7 kB)
Downloading setuptools-75.7.0-py3-none-any.whl (1.2 MB)
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1.2/1.2 MB 4.5 MB/s eta 0:00:00
Installing collected packages: setuptools
Successfully installed setuptools-75.7.0

Now it works:

$ pipupgrade --check
Checking...