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Popen.std* attributes are now IO[Any] #15827
Description
in #15654, these attributes were made less typesafe by changing their type from IO[AnyStr] to IO[Any]:
from subprocess import PIPE, Popen
with Popen(["echo", "hi"], stdout=PIPE, text=True) as process:
if process.stdout:
for line in process.stdout:
line.asdfasdf # no type error, crashes at runtimethere didn't seem to be any explanation for this change in that PR which is why i'm opening a new issue. is there a reason the types can't be IO[AnyStr]?
Activity
nightcityblade commentedon Aug 12, 2026
Hi, I'd like to work on this. I'll submit a focused PR shortly.
nightcityblade commentedon Aug 12, 2026
I took a closer look and won't be able to complete this within the current contribution batch. Releasing it for someone else—sorry for the noise.
srittau commentedon Aug 12, 2026
I'm actually not sure why I changed this, this seems more like an accident and should be restored.
Boulea7 commentedon Aug 13, 2026
I reproduced the loss of the
Popen[str]andPopen[bytes]stream types on current main. I’ll restore the attributes to use the class type parameter and run the subprocess stub checks.