making : optional

[Skaperen]

i didn't think about slices although a different language could require tuples be inside () and use , in place of : in the square brackets. i was thinking about the : that follow keywords like def, if, else, for, while, try. except ... well, eventually follow. what if that language looked like:

class GetItem
    def __class_getitem__(self, key)
        if isinstance(key, slice)
            print("Key is a slice")
        elif isinstance(key, tuple)
            print("Key is a tuple")
            if all(isinstance(item, slice) for item in key)
                print("All items are slices")
            elif any(isinstance(item, slice) for item in key)
                print("One or more items are a slice instance")
        else
            print("Got something else")
        return key
...