Ethan Furman <et...@stoneleaf.us> added the comment:

Serhiy is correct.  The exact return type only needs to be ordered, and have 
appropriate dictionary methods such as `keys()`, `values()`, and `items()`.

The reason a mappingproxy was chosen is exactly because what you just tried is 
illegal and/or confusing:

- illegal because an Enum cannot be modified that way
- confusing because the dictionary returned is only a copy of the Enum class' 
__dict__, and successful attempts to modify it would not change the Enum class.

It is an implementation detail because the exact type of dictionary returned 
could change in the future.

----------
assignee: docs@python -> ethan.furman
resolution:  -> not a bug
stage: patch review -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33862>
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