[issue42841] Add bitwise or operator to collections.abc Mapping and MutableMapping

[Yurii Karabas]

Yurii Karabas <1998uriyyo at gmail.com> added the comment:

Thanks, for the replies, didn't know about that.

Interesting thing that `collections.abc.Set` base class has implementations of `__and__`, `__or__`, `__sub__` and `__xor__` methods, it also provide `_from_iterable` class method that is used to create `Set` instance from iterable (all of those operators use this method).
```
class Set(Collection):
    ...
    @classmethod
    def _from_iterable(cls, it):
        '''Construct an instance of the class from any iterable input.

        Must override this method if the class constructor signature
        does not accept an iterable for an input.
        '''
        return cls(it)
```

Basically, my proposition was to do smth similar to `collections.abc.Mapping`, but I understand your motivation not to implement this feature.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42841>
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