Use either the typing.TextIO
or typing.BinaryIO
types, for files opened in text mode or binary mode respectively.
From the docs:
class
typing.IO
Wrapper namespace for I/O stream types.
This defines the generic type
IO[AnyStr]
and aliasesTextIO
andBinaryIO
for respectivelyIO[str]
andIO[bytes]
. These representing the types of I/O streams such as returned byopen()
.
The short answer:
from typing import TextIO
not just from typing import *
.IO
to mean a file without specifying what kindTextIO
or BinaryIO
if you know the typeAs an example:
from typing import BinaryIO
def binf(inf: BinaryIO):
pass
with open('x') as f:
binf(f)
gives an inspection error (in PyCharm) of Expected type 'BinaryIO', got 'TextIO' instead
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