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MYPYPATH results in AssertionError: ImportedName(_collections.defaultdict) #5901

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AstraLuma opened this issue Nov 16, 2018 · 5 comments
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MYPYPATH results in AssertionError: ImportedName(_collections.defaultdict) #5901

AstraLuma opened this issue Nov 16, 2018 · 5 comments

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@AstraLuma
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If I leave something extra in $MYPYPATH (I'm not sure I understand what exactly), I get this error:

Traceback (most recent call last):
  File "/home/travis/virtualenv/python3.6.3/bin/mypy", line 11, in <module>
    sys.exit(console_entry())
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/mypy/__main__.py", line 7, in console_entry
    main(None)
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/mypy/main.py", line 92, in main
    res = build.build(sources, options, None, flush_errors, fscache)
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/mypy/build.py", line 155, in build
    result = _build(sources, options, alt_lib_path, flush_errors, fscache)
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/mypy/build.py", line 204, in _build
    graph = dispatch(sources, manager)
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/mypy/build.py", line 2172, in dispatch
    process_graph(graph, manager)
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/mypy/build.py", line 2469, in process_graph
    process_stale_scc(graph, scc, manager)
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/mypy/build.py", line 2582, in process_stale_scc
    manager.semantic_analyzer.add_builtin_aliases(typing_mod)
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/mypy/semanal.py", line 3415, in add_builtin_aliases
    target = self.named_type_or_none(target_name, [])
  File "/home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages/mypy/semanal.py", line 1369, in named_type_or_none
    assert isinstance(node, TypeInfo), node
AssertionError: ImportedName(_collections.defaultdict)
@AstraLuma AstraLuma mentioned this issue Nov 16, 2018
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@gvanrossum
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Probably the extra thing you have in $MYPYPATH overrides a basic stdlib module (e.g. typing). We can't help you further unless you show the contents of $MYPYPATH.

@AstraLuma
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Ok, from my travis experiments:

These are insufficient, as mypy doesn't discover pip installed modules:

@ilevkivskyi
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Have read the docs? https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports

Another note is we really need to implement #5241 (raised priority to high), my guess this is what causes users to abuse MYPYPATH.

@AstraLuma
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I was about to write a big long thing about how it's a library that I contribute to and I've been working very hard to make it happy with both subclassing and mypy.

And then I realized that none of that work had actually been released to pypi yet, so what travis and mypy are seeing is a completely unannotated library.

Would it be possible to distinguish between "This library exists, but has no annotations" and "No, sorry, it's just not here at all"? The error message implies the latter, when in this case, the former seems to have happened.

@ilevkivskyi
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Would it be possible to distinguish between "This library exists, but has no annotations" and "No, sorry, it's just not here at all"? The error message implies the latter, when in this case, the former seems to have happened.

We already have an issue for a better error message #4542

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3 participants
@AstraLuma @gvanrossum @ilevkivskyi