Package: black
Version: 20.8b1-1
Severity: grave
Justification: renders package unusable

Dear Maintainer,

The new black package version 20.8b1-1 seems to be missing some files:

% black
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/black/__init__.py", line 63, in <module>
    from black._black_version import version as __version__
ModuleNotFoundError: No module named 'black._black_version'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/black", line 33, in <module>
    sys.exit(load_entry_point('black==20.8b1', 'console_scripts', 'black')())
  File "/usr/bin/black", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/usr/lib/python3.8/importlib/metadata.py", line 77, in load
    module = import_module(match.group('module'))
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib/python3/dist-packages/black/__init__.py", line 65, in <module>
    from _black_version import version as __version__
ModuleNotFoundError: No module named '_black_version'

Looking at the source, _black_version.py appears to be generated by the 
setup.py:
https://github.com/psf/black/blob/master/setup.py#L50-L53

Regards,


-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable'), (101, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.8.0-2-amd64 (SMP w/8 CPU threads)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE=en_US
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages black depends on:
ii  python3                    3.8.2-3
ii  python3-appdirs            1.4.4-1
ii  python3-click              7.1.2-1
ii  python3-mypy-extensions    0.4.3-1
ii  python3-pathspec           0.8.0-1
ii  python3-pkg-resources      49.3.1-2
ii  python3-regex              0.1.20200714-1
ii  python3-toml               0.10.1-1
ii  python3-typed-ast          1.4.1-1+b1
ii  python3-typing-extensions  3.7.4.2-1

black recommends no packages.

Versions of packages black suggests:
pn  python-black-doc  <none>

-- no debconf information

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