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vainaixr opened this issue Apr 13, 2022 · 2 comments
Closed

more controlled inheritance #91509

vainaixr opened this issue Apr 13, 2022 · 2 comments

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@vainaixr
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vainaixr commented Apr 13, 2022 •
edited
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is this possible?
if possible. would it be useful?

class A:
    @no_inherit
    def method_one(self, x):
        # implementation of method_one
    
    @no_override
    def method_two(self, x):
        # implementation of method_two
    
    def method_three(self, x):
        # implementation of method_three

class B(A):
    def method_two(self, x):
        # changed implementation of method_two

but method_one does not get inherited,
and
for method_two, the changed implementation does not work, the implementation described in class A for method_two stays for all the child classes.
@wookie184
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For @no_inherit I could be missing something but I don't really see any use. Rather than preventing the method from being inherited, you can just not use it if you don't want/need it. If you want to force a method to be redefined you may want an abc (https://peps.python.org/pep-3119/)).

For @no_override you can use typing.final https://docs.python.org/3/library/typing.html#typing.final, this isn't enforced at runtime, but I don't think that's an issue. I think you could also take advantage of name mangling for some use cases https://docs.python.org/3/tutorial/classes.html#private-variables

If you wanted to enforce either of these you could probably write a metaclass that did, although I can't think of any use cases where it should be necessary.

@zware
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zware commented Apr 13, 2022

Please direct usage questions to the Users section of discuss.python.org.

@zware zware closed this as completed Apr 13, 2022
@ezio-melotti ezio-melotti mentioned this issue Apr 15, 2022
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@zware @wookie184 @vainaixr