cattrs fails on pypy

[ygl-rg]

• cattrs version: 22.1
• Python version: 3.9.10 (Pypy 7.3.9)
• Operating System: Windows 10

Description

cattrs fails to import.

raised error like this

TypeError: 'module' object is not iterable

in _compat.py, there is

  if "ExceptionGroup" not in __builtins__:
     from exceptiongroup import ExceptionGroup
  else:
    ExceptionGroup = ExceptionGroup

according to the pypy's doc https://doc.pypy.org/en/latest/cpython_differences.html

"the builtins name is always referencing the builtin module, never a dictionary as it sometimes is in CPython"

so "if "ExceptionGroup" not in builtins" is invalid on pypy

What I Did

  import cattrs

[Tinche]

Ooph, need to figure out a fix for this then. Maybe even reenable PyPy tests; they were disabled because they were suuuper slow.

[ofiriluz]

this also started affecting other packages i think
see:
aws/aws-cdk#19844

[Tinche]

Fixed on main! Also reenabled the tests.

[mgedmin]

I suddenly started seeing this error in my daily GitHub action rebuilds. Presumably GHA upgraded their PyPI images recently, since I've never seen this error before?

Do you have any plans to publish a PyPI release with the fix in the near future?

[Tinche]

Yep, it's in my queue!

[lloesche]

Ran into this issue today. A release version that works on PyPy would be very much appreciated.

[jpmckinney]

I added 'cattrs!=22.1.0;platform_python_implementation=="PyPy"' to install_requires, which is kind of bananas, but it fixed CI for me.