Add option to keep tmp dir to stubtest script

[srittau]

Also add prefix to tmpdir name

[srittau]

I'm very confused about the mypy error on win32. Can anyone shed a light on what I did wrong?

https://github.com/python/typeshed/actions/runs/9547845403/job/26313973228?pr=12151

[Avasam]

I'm very confused about the mypy error on win32. Can anyone shed a light on what I did wrong?

python/typeshed/actions/runs/9547845403/job/26313973228?pr=12151

idk, the error doesn't even look related to your changes, and the pre-existing check looks correct. Maybe you found a new false-positive by wrapping in an additional try-except block?

[srittau]

This is python/mypy#14309. I will disable "possibly-undefined" for now.