Correctly classify builtin static and class methods

[serhiy-storchaka]

BPO	32265
Nosy	@serhiy-storchaka, @1st1
PRs	#4776

^{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 = None
closed_at = <Date 2017-12-15.12:14:40.293>
created_at = <Date 2017-12-09.22:54:10.274>
labels = ['3.7', 'type-feature', 'library']
title = 'Correctly classify builtin static and class methods'
updated_at = <Date 2017-12-15.12:14:40.292>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2017-12-15.12:14:40.292>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2017-12-15.12:14:40.293>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2017-12-09.22:54:10.274>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 32265
keywords = ['patch']
message_count = 2.0
messages = ['307928', '308389']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'yselivanov']
pr_nums = ['4776']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue32265'
versions = ['Python 3.7']

[serhiy-storchaka]

Currently class and some static methods of builtin types are classified as plain methods. The proposed patch adds types.ClassMethodDescriptorType for unbound class methods of builtin types and makes inspect.classify_class_attrs() correctly classifying static and class methods of builtin types. This results in changing the help() output.

All __new__ methods now are classified as static.

Examples of class methods are dict.fromkeys and int.from_bytes.

[serhiy-storchaka]

New changeset 3327a2d by Serhiy Storchaka in branch 'master':
bpo-32265: Classify class and static methods of builtin types. (bpo-4776)
3327a2d