ImportError: cannot import name 'TypeVarDef' from 'mypy.types'

[adam-pawluczuk]

Bug Report

TypeVarDef raises an ImportError.

To Reproduce

1. On Python 3.8.9, when doing:

from mypy.types import TypeVarDef

I get this:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'TypeVarDef' from 'mypy.types' (/Users/username/Library/Python/3.8/lib/python/site-packages/mypy/types.py)

Expected Behavior

No errors.

Actual Behavior

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'TypeVarDef' from 'mypy.types' (/Users/username/Library/Python/3.8/lib/python/site-packages/mypy/types.py)

Your Environment

• Mypy version used: 0.920
• Mypy command-line flags:
• Mypy configuration options from mypy.ini (and other config files):
• Python version used: 3.8.9
• Operating system and version: MacOS 12.1

[hauntsaninja]

Yes, see #6617 (comment)

If you're coming from pydantic, you can fix it by doing what I suggest here: pydantic/pydantic#3175 (comment)

[adam-pawluczuk]

Thank you for the link!

I believe the issue comes from pydantic:

https://github.com/samuelcolvin/pydantic/blob/master/pydantic/mypy.py#L62

In our codebase we do not import TypeVarDef anywhere.

Created an issue for pydantic:
pydantic/pydantic#3528