Investigate if pex tool can better handle importlib_metadata.version calls

[tiagovtristao]

Having the dependency below:

python_wheel(name="prettytable",
             outs=["prettytable", "prettytable-2.2.1.dist-info"],
             hashes=["09fb2c7f93e4f93e0235f05ae199ac3f16da3a251b2cfa1c7108b34ede298fa3"],
             licences=["BSD 3-Clause"],
             version="2.2.1",
             deps=[":wcwidth"])

And trying to import the library on a python script results in:

Traceback (most recent call last):
  File "/opt/tm/tools/python/3.9.6/usr/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/.../usr/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/.../third_party_versions/pypi_versions.pex/__main__.py", line 385, in <module>
  File "/.../third_party_versions/pypi_versions.pex/__main__.py", line 377, in run
  File "/.../third_party_versions/pypi_versions.pex/__main__.py", line 351, in interact
  File "/.../third_party_versions/pypi_versions.pex/__main__.py", line 360, in main
  File "/.../usr/lib/python3.9/runpy.py", line 213, in run_module
    return _run_code(code, {}, init_globals, run_name, mod_spec)
  File "/.../usr/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File ".../third_party_versions/pypi_versions.py", line 20, in <module>
    from third_party.python3 import prettytable
  File ".../third_party_versions/pypi_versions.pex/__main__.py", line 188, in load_module
  File "/.../usr/lib/python3.9/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen zipimport>", line 259, in load_module
  File "/.../third_party_versions/pypi_versions.pex/third_party/python3/prettytable/__init__.py", line 50, in <module>
  File "/.../usr/lib/python3.9/importlib/metadata.py", line 551, in version
    return distribution(distribution_name).version
  File "/.../usr/lib/python3.9/importlib/metadata.py", line 524, in distribution
    return Distribution.from_name(distribution_name)
  File "/.../usr/lib/python3.9/importlib/metadata.py", line 187, in from_name
    raise PackageNotFoundError(name)
importlib.metadata.PackageNotFoundError: prettytable

The offending statement in prettytable is __version__ = importlib_metadata.version(__name__).

The current workaround is to replace importlib_metadata.version(__name__) with the package version via a patch. Ideally, we wouldn't need to do this.

[stale[bot]]

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