[issue26495] super() does not work in nested functions, genexps, listcomps, and gives misleading exceptions

[Antti Haapala]

Antti Haapala added the comment:

super() without arguments gives proper "super() without arguments" in functions, generator functions nested in methods, if *those* do not have arguments. But if you use super() in a nested function that takes an argument, or in a generator expression or a comprehension, you'd get 

    Got exception: TypeError super(type, obj): obj must be an instance or subtype of type

which is really annoying. Furthermore, if a nested function took another instance of type(self) as the first argument, then super() could refer unexpectedly to wrong instance:

    class Bar(Foo):
        def calculate(self, other_foos):
            def complicated_calculation(other):
                super().some_method(other)

            for item in other_foos:
                complicated_calculation(item)

now the `super()` call would not have implied `self` of `calculate` as the first argument, but the `other` argument of the nested function, all without warnings.

I believe it is a mistake that these nested functions can see `__class__` at all, since it would just mostly lead them misbehaving unexpectedly.

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components: +Interpreter Core
title: super() does not work nested -> super() does not work in nested functions, genexps, listcomps, and gives misleading exceptions

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26495>
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