[BUG] scm6 seems to generate unexpected version.py - ModuleNotFoundError when importing urwid (no __version__)

[jhgit]

Description:

$ python3.9 -c 'import urwid'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/var/run/amd/duck/z/h/jhein/gen/src/git/urwid/urwid/urwid/__init__.py", line 114, in <module>
    from urwid.version import __version__, __version_tuple__
ModuleNotFoundError: No module named 'urwid.version'

It turns out that if you build with an older py-setuptools_scm (e.g., 6.4.2), the build creates a version.py that looks like the following:

$ cat /usr/local/lib/python3.9/site-packages/urwid/version.py
# coding: utf-8
# file generated by setuptools_scm
# don't change, don't track in version control
version = '2.2.3'
version_tuple = (2, 2, 3)

Notice there is no __version__.

pyproject.toml claims that it can use any version of py-setuptools_scm >= 6.2 (commit 8d8e4b6). Maybe that is not correct? I did not (yet) dig into the difference between scm6 and scm7 that causes a different version.py to be generated.

Affected versions (if applicable)

2.2.0 - 2.2.3

Steps to reproduce (if applicable)

Install py-setuptools_scm 6.4.2 (possibly any 6.x version?). Build urwid (from source tarball at PyPI). Check version.py in build/.

Expected/actual outcome

expected: successful import of the urwid package, of course.