4 ms·

This is not mypy, it's "python-the-language": the annotations are values, and, in this case, the method annotations are evaluated when encountered - which is be

by _ZeD_ 7y ago

This is not mypy, it's "python-the-language": the annotations are values, and, in this case, the method annotations are evaluated when encountered - which is before the end of the class. So you are trying to use a value still not defined. It's like doing something like def foo() -> Bar: ... class Bar: ... obviously the python interpreter cannot find a "Bar" definition during the parsing of the foo function

BurningFrog 7y ago
You're saying this is how the language works. I'm saying the language could work differently. The case of referring to a class inside its definition is quite different from your "Bar" case. The thing referred to is already declared, it's just not fully defined yet. There is no logical reason I can see making it impossible for Python to honor the obvious intention of the programmer here. It seems it has just chosen not to do so. Though I'll admit I haven't thought through every weird corner case :)