Errors depend on the existence of `.mypy_cache`

[Vasniktel]

Bug Report

Depending on the existence of the cache, mypy can produce different errors.

To Reproduce

This issue can be reproduced using the spacy library.

1. docker run -it python:3.9-slim bash
2. pip install spacy==3.1.1 mypy==0.910
3. Create a test file to check:

import spacy

spacy.cli.download('en_core_web_sm')

4. Add mypy configs:

[mypy]
python_version = 3.9
strict = True
show_error_codes = True
pretty = True
warn_unreachable = True

Expected Behavior

One would expect that mypy errors should not depend on the cache existence.

Actual Behavior

Run mypy .. This will produce the following report the first time:

test.py:3: error: Module not callable [operator]
spacy.cli.download('en_core_web_sm')
^
Found 1 error in 1 file (checked 1 source file)

The second time (when .mypy_cache exists) you'll get:

test.py:3: error: Module has no attribute "cli" [attr-defined]
spacy.cli.download('en_core_web_sm')
^
Found 1 error in 1 file (checked 1 source file)

Your Environment

• Mypy version used: 0.910
• Python version used: 3.9.6

[hauntsaninja]

Thanks, duplicate report, see #9852 (comment)

[hauntsaninja]

Fixed by #10937