8000 `type: ignore` only works when deleting mypy cache · Issue #9777 · python/mypy · GitHub
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l0b0 opened this issue Dec 2, 2020 · 1 comment
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type: ignore only works when deleting mypy cache #9777

l0b0 opened this issue Dec 2, 2020 · 1 comment
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bug mypy got something wrong

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@l0b0
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l0b0 commented Dec 2, 2020 •
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Bug Report

mypy reliably fails to take into account a type: ignore comment on the second run after deleting the cache.

To Reproduce

  1. rm -r .mypy_cache
  2. mypy .
  3. mypy .

Expected Behavior

The second run of mypy should behave exactly the same as the first run.

Actual Behavior

$ rm -r .mypy_cache
$ mypy .
Success: no issues found in 23 source files
$ mypy .
infra/app.py:9: error: Skipping analyzing 'aws_cdk': found module but no type hints or library stubs
infra/datalake/datalake_stack.py:4: error: Skipping analyzing 'aws_cdk': found module but no type hints or library stubs
infra/datalake/datalake_stack.py:4: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
Found 2 errors in 2 files (checked 23 source files)

Some subsequent runs will succeed, but I've not looked into the pattern. I was able to run while pre-commit run --all-files mypy; do rm -r .mypy_cache; done a bunch of rounds without failure.

Your Environment

  • Mypy version used: 0.790
  • Mypy command-line flags: None
  • Mypy configuration options from mypy.ini (and other config files): None
  • Python version used: 3.8.6
  • Operating system and version: Arch Linux

Relevant commit

Workaround

Add --no-incremental to the mypy arguments.
@l0b0 l0b0 added the bug mypy got something wrong label Dec 2, 2020
@hauntsaninja hauntsaninja mentioned this issue Dec 30, 2020
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@hauntsaninja
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Fixed by #10937

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