In a directory with 2 files, setup.cfg and a single C file containing source for an extension module. The same happens with a pure-python module. This is on Windows.

PS D:\Data\python-sample> D:\Data\cpython\PCbuild\python.exe -m packaging.run run --list-commands
List of available commands:
  bdist: create a built (binary) distribution
  bdist_dumb: create a "dumb" built distribution
Traceback (most recent call last):
  File "D:\Data\cpython\lib\packaging\util.py", line 652, in resolve_name
    ret = getattr(ret, part)
AttributeError: 'module' object has no attribute 'bdist_msi'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:\Data\cpython\lib\runpy.py", line 160, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "D:\Data\cpython\lib\runpy.py", line 73, in _run_code
    exec(code, run_globals)
  File "D:\Data\cpython\lib\packaging\run.py", line 666, in <module>
    sys.exit(main())
  File "D:\Data\cpython\lib\packaging\run.py", line 653, in main
    return dispatcher()
  File "D:\Data\cpython\lib\packaging\run.py", line 642, in __call__
    return func(self, self.args)
  File "D:\Data\cpython\lib\packaging\run.py", line 91, in wrapper
    return f(*args, **kwargs)
  File "D:\Data\cpython\lib\packaging\run.py", line 264, in _run
    cls = dispatcher.cmdclass.get(cmd) or get_command_class(cmd)
  File "D:\Data\cpython\lib\packaging\command\__init__.py", line 61, in get_command_class
    cls = resolve_name(cls)
  File "D:\Data\cpython\lib\packaging\util.py", line 654, in resolve_name
    raise ImportError(exc)
ImportError: 'module' object has no attribute 'bdist_msi'