Às 21:36 de 23/10/22, Paulo da Silva escreveu:
Hello!
I am in the process of "typing" of some of my scripts.
Using it should help a lot to avoid some errors.
But this is new for me and I'm facing some problems.
Let's I have the following code (please don't look at the program content):
f=None # mypy naturally assumes Optional(int) because later, at open,
it is assigned an int.
..
if f is None:
f=os.open(...
..
if f is not None:
os.write(f, ...)
..
if f is not None:
os.close(f)
When I use mypy, it claims
Argument 1 to "write" has incompatible type "Optional[int]"; expected "int"
Argument 1 to "close" has incompatible type "Optional[int]"; expected "int"
How to solve this?
Is there a way to specify that when calling os.open f is an int only?
And yes there is! Exactly the "cast" operator. A mistype led me to wrong
search results. I'm sorry.
So, in the above code, we have to do:
os.write(cast(int,f), ...)
and
os.close(cast(int,f), ...)
Regards.
Paulo
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