How to type hint with walrus operator?

Question

I am trying to type hint a walrus operator expression, i.e.

while (var: int := some_func()): ...

How can I do this?

Answer 1

It's not possible. From PEP 572

Inline type annotations are not supported:

You need to declare the variable before the while loop, and you can specify the type there.

var: int
while var := some_func():
    ...