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Yes, those should both be is checks -- enum members are singletons, so a copy of any kind should return the exact same object.
[copy module questions]
An enum class, such as Color, is processed by that branch; a member, such as Color.RED, falls through to the else branch where a __deepcopy__ is looked for.
Enum.__copy__ and Enum.__deepcopy__ just need to return self.
Ohh, I thought, this one also got reported on StackOverflow just like a calendar module feature I once picked.
I have added a PR
Btw, I learned a lot about Enum's internal design because of the wrong assumption that deep-copy(Enum or its member) will return a new Enum
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Agent-Hellboy commentedon Jul 11, 2023
Hi @ethanfurman, I thought of implementing this.
did you mean we should be able to make a deep copy of the whole enum like adding
ischeck in herehttps://github.com/python/cpython/blob/1f2921b72c369b19c2e32aaedb9f8c63e0cb8b48/Lib/test/test_enum.py#L803C1-L808C35
if yes, then we need to make changes in copy module because Enums are getting created using a custom metaclass
and deep copy returns the object as it is if the class is a subclass of a type
https://github.com/python/cpython/blob/1f2921b72c369b19c2e32aaedb9f8c63e0cb8b48/Lib/copy.py#L137C1-L139C42
Where did the bug get reported? Do you know if I can see the StackOverflow link?
if it's about copying a member (adding deepcopy in Enum) then I will explore more
currently, it is taking the same object for new_enum as well as self
ethanfurman commentedon Jul 11, 2023
Yes, those should both be
ischecks -- enum members are singletons, so a copy of any kind should return the exact same object.An enum class, such as
Color, is processed by that branch; a member, such asColor.RED, falls through to theelsebranch where a__deepcopy__is looked for.Enum.__copy__andEnum.__deepcopy__just need to returnself.This issue is where the bug was reported.
ethanfurman commentedon Jul 11, 2023
The current
test_copyis testing an enum class -- we need to add a test for enum members. All those copy tests should be usingis.pythongh-106602: Add __copy__ and __deepcopy__ in Enum
pythongh-106602: Add __copy__ and __deepcopy__ in Enum
Agent-Hellboy commentedon Jul 12, 2023
Ohh, I thought, this one also got reported on StackOverflow just like a calendar module feature I once picked.
I have added a PR
Btw, I learned a lot about Enum's internal design because of the wrong assumption that deep-copy(Enum or its member) will return a new Enum
gh-106602: [Enum] Add __copy__ and __deepcopy__ (GH-106666)
pythongh-106602: [Enum] Add __copy__ and __deepcopy__ (pythonGH-106666)
pythongh-106602: [Enum] Add __copy__ and __deepcopy__ (pythonGH-106666)
[3.12] gh-106602: [Enum] Add __copy__ and __deepcopy__ (GH-106695)
[3.11] gh-106602: [Enum] Add __copy__ and __deepcopy__ (GH-106694)
ethanfurman commentedon Jul 12, 2023
Thanks, @Agent-Hellboy, for the help!
Agent-Hellboy commentedon Jul 13, 2023
Thanks @ethanfurman, looking forward to contributions like these.
Add betterproto.Enum __copy__ and __deepcopy__ implementations
Add betterproto.Enum __copy__ and __deepcopy__ implementations (#566)
Add betterproto.Enum __copy__ and __deepcopy__ implementations (#566)