Enum's dir() does not contain inherited members

[serhiy-storchaka]

BPO	45535
Nosy	@warsaw, @ethanfurman, @serhiy-storchaka, @AlexWaygood
PRs	bpo-45535: Improve output of Enum dir() #29316 bpo-45535: [Enum] include special dunders in dir() #30677
Superseder	bpo-40066: Enum: modify repr, str; update docs
Files	Enum_dir_patch.txt enum_dir_output_with_patch.txt

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/ethanfurman'
closed_at = <Date 2022-01-17.17:02:11.779>
created_at = <Date 2021-10-20.10:35:06.095>
labels = ['type-bug', 'library', '3.10', '3.11']
title = "Enum's dir() does not contain inherited members"
updated_at = <Date 2022-01-18.23:13:23.710>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2022-01-18.23:13:23.710>
actor = 'ethan.furman'
assignee = 'ethan.furman'
closed = True
closed_date = <Date 2022-01-17.17:02:11.779>
closer = 'ethan.furman'
components = ['Library (Lib)']
creation = <Date 2021-10-20.10:35:06.095>
creator = 'serhiy.storchaka'
dependencies = []
files = ['50382', '50383']
hgrepos = []
issue_num = 45535
keywords = ['patch']
message_count = 11.0
messages = ['404420', '404621', '404634', '404635', '404721', '405313', '405320', '405323', '407539', '410807', '410912']
nosy_count = 5.0
nosy_names = ['barry', 'eli.bendersky', 'ethan.furman', 'serhiy.storchaka', 'AlexWaygood']
pr_nums = ['29316', '30677']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = '40066'
type = 'behavior'
url = 'https://bugs.python.org/issue45535'
versions = ['Python 3.10', 'Python 3.11']

[serhiy-storchaka]

For example:

>>> from enum import *
>>> class E(IntEnum):
... x = 1
... 
>>> dir(E)
['__class__', '__doc__', '__members__', '__module__', 'x']
>>> E.from_bytes
<built-in method from_bytes of EnumType object at 0x559d47415ce0>
>>> E.to_bytes
<method 'to_bytes' of 'int' objects>
>>> E.numerator
<attribute 'numerator' of 'int' objects>
>>> E.__add__
<slot wrapper '__add__' of 'int' objects>

There are methods and attributes inherited from int, but they are not shown in dir(). As result they are absent in help() and completion does not work for them.

[AlexWaygood]

I had a go at writing a patch for __dir__ that would include any methods an enum class had acquired through int/str/etc. mixins, while continuing to ignore enum dunders and sunders (as is currently the case). My patch also allows user-defined methods defined in enum subclasses to show up in the help() output, whereas they currently do not, since help(enum_member) looks up dir(enum_class) rather than dir(enum_member).

The patch is a fair way more complex than the the existing code, however.

[ethanfurman]

Looks interesting, thank you for the patch.