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"BinaryIO" has no attribute "peek" #8433
Description
- I think this is a bug, but whether it's in mypy or typeshed I do not know.
- I am running with
mypy --strict.
Mypy version: 0.670
I've got a snippet like this:
with open(self.path, "rb") as infile:
if infile.peek(2)[0:2] == b'\x1f\x8b':
...mypy guesses that this type is BinaryIO, but that it does not have the peek() method. That type is correct with regard to the abstract types of things open() can return, but in this case it's an _io.BufferedReader, which does have peek().
Activity
jnsnow commentedon Feb 22, 2020
I came across #2166, but this looks more like stub definition problems. This case appears to be that
peekis really only applicable to a very specific subclass that open() can return to which BinaryIO is not meant to apply, necessarily.For now, I suppose my workaround is this:
JukkaL commentedon Feb 28, 2020
BinaryIOandopenare defined in typeshed. If you believe that this could be improved, you can file a typeshed issue.