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Wrong stub for fileinput.input() #7922
Description
the stubs appear to be wrong here:
Line 32 in 6e18441
Only theopenhookargument constrains the TypeVar, but it has a default, and if the argument is not given there's nothing for the type checker to use to decide on the value of the TypeVar. The typeshed stub should be changed to add a separate overload whereopenhookis not given.
Activity
AlexWaygood commentedon May 22, 2022
The stubs at the moment look quite buggy indeed! From my reading of the source code, I don't think it's actually the
openhookparameter at all that determines whether the object returned is of typeFileInput[str]orFileInput[bytes]. Instead, it's the value passed into themodeparameter. (You can see this by looking at theFileInput._readlinemethod, which is called fromFileInput.__next__.)IO modes can be tricky to type in stub files, but it should be possible.
fileinput: Fix TypeVar usage
`fileinput`: Fix `TypeVar` usage (#7934)