More "syntax error in type comment"s

[benknoble]

Bug Report

Related to #8627

To Reproduce

# cat <<DOG > some.py
import subprocess
DOG
# mypy some.py | head
/Users/Knoble/Library/Python/3.9/lib/python/site-packages/mypy/typeshed/stdlib/3/subprocess.pyi:50: error: syntax error in type comment
/Users/Knoble/Library/Python/3.9/lib/python/site-packages/mypy/typeshed/stdlib/3/subprocess.pyi:63: error: syntax error in type comment
/Users/Knoble/Library/Python/3.9/lib/python/site-packages/mypy/typeshed/stdlib/3/subprocess.pyi:66: error: syntax error in type comment
/Users/Knoble/Library/Python/3.9/lib/python/site-packages/mypy/typeshed/stdlib/3/subprocess.pyi:67: error: syntax error in type comment
/Users/Knoble/Library/Python/3.9/lib/python/site-packages/mypy/typeshed/stdlib/3/subprocess.pyi:77: error: syntax error in type comment
/Users/Knoble/Library/Python/3.9/lib/python/site-packages/mypy/typeshed/stdlib/3/subprocess.pyi:78: error: syntax error in type comment
/Users/Knoble/Library/Python/3.9/lib/python/site-packages/mypy/typeshed/stdlib/3/subprocess.pyi:79: error: syntax error in type comment
/Users/Knoble/Library/Python/3.9/lib/python/site-packages/mypy/typeshed/stdlib/3/subprocess.pyi:80: error: syntax error in type comment
/Users/Knoble/Library/Python/3.9/lib/python/site-packages/mypy/typeshed/stdlib/3/subprocess.pyi:81: error: syntax error in type comment
/Users/Knoble/Library/Python/3.9/lib/python/site-packages/mypy/typeshed/stdlib/3/subprocess.pyi:82: error: syntax error in type comment
# trimmed …

Expected Behavior

No issues

Actual Behavior

Unable to effectively sort through messages because of the ~360 from this module alone

Your Environment

• Mypy version used: 740 and 790
• Mypy command-line flags: none
• Mypy configuration options from mypy.ini (and other config files): none
• Python version used: 3.9.1
• Operating system and version: macOS Mojave 10.14.6 18G5033 x86_64

[hauntsaninja]

Expected on 0.740, but was fixed well before 0.790 (and I can't repro). Feel free to re-open if you can't get it to work, but closing since I'm quite sure you're still using an old mypy (maybe try hash -r).

[benknoble]

Hm, yes, in spite of installing a fresh copy in a venv, it seems there was an issue with which mypy was used. Thank you.

[sshaikh]

I'm trying to use mypy 0.812 with python 3.9.4 on Arch but am seeing these:

/home/user/.cache/pre-commit/repobrxmsytl/py_env-python3/lib/python3.9/site-packages/mypy/typeshed/stdlib/2and3/builtins.pyi:1679: error:
syntax error in type comment  [syntax]
            def truncate(self, pos: Optional[int] = ...) -> int: ...

I'm also using venv if that makes a difference?

EDIT:

My fault - fixed by updating the version of mypy being called via pre-commit.

[robbrit]

For those who have gotten this after an upgrade to Python 3.9, I was able to get things fixed with mypy==0.782.

[ethanhs]

I generally would recommend running the latest mypy unless something is holding you back.

[robbrit]

In an ideal world yup, but unfortunately because of the breaking changes that get introduced in new versions of mypy, the amount of effort required to upgrade something is O(nm), n being the size of the codebase and m being the difference in versions.