Andrew Svetlov <[email protected]> added the comment:
I thought __class_getitem__ was invented exactly to simplify generic types
support.
The only thing that confuses me an example from PEP 560:
class MyList:
def __getitem__(self, index):
return index + 1
def __class_getitem__(cls, item):
return f"{cls.__name__}[{item.__name__}]"
It prevents from instantiating a generic on inheritance, e.g. the following
code raises TypeError:
class MyOtherList(MyList[int]):
pass
It would be nice if Ivan clarifies what is the best practice in this case.
I think the method should return unmodified class, not a string.
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<https://bugs.python.org/issue38978>
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