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__doc__ attribute is not set in property-derived classes · Issue #85459 · python/cpython · GitHub
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__doc__ attribute is not set in property-derived classes #85459

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__doc__ attribute is not set in property-derived classes#85459
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type-featureA feature request or enhancement

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@sizmailov
sizmailov
mannequin
opened on Jul 12, 2020
BPO 41287
Nosy @rhettinger, @tirkarthi, @sizmailov
PRs
  • bpo-41287: Handle doc argument of property.__init__ in subclasses #23205
    		•

    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 = None
created_at = <Date 2020-07-12.20:34:43.594>
labels = []
title = '__doc__ attribute is not set in property-derived classes'
updated_at = <Date 2020-11-09.10:20:58.378>
user = 'https://github.com/sizmailov'

    bugs.python.org fields:

    activity = <Date 2020-11-09.10:20:58.378>
actor = 'Sergei Izmailov'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2020-07-12.20:34:43.594>
creator = 'Sergei Izmailov'
dependencies = []
files = []
hgrepos = []
issue_num = 41287
keywords = ['patch']
message_count = 3.0
messages = ['373571', '373624', '373627']
nosy_count = 3.0
nosy_names = ['rhettinger', 'xtreak', 'Sergei Izmailov']
pr_nums = ['23205']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue41287'
versions = []

    Activity

    1. sizmailov commented on Jul 12, 2020

      @sizmailov
      sizmailovmannequin
      on Jul 12, 2020
      MannequinAuthor

      MRE:

      class Property(property):
    pass

      print(Property(None, None, None, "hello").__doc__)

      Expected:
      hello

      Actual:
      None

    2. rhettinger commented on Jul 14, 2020

      @rhettinger
      rhettinger
      on Jul 14, 2020
      Contributor

      What would you expect this to print?

      class Property(property):
    'custom docstring'

      print(Property(None, None, None, "hello").__doc__)

    3. sizmailov commented on Jul 14, 2020

      @sizmailov
      sizmailovmannequin
      on Jul 14, 2020
      MannequinAuthor
      class Property(property):
    'custom docstring'

      print(Property(None, None, None, "hello").__doc__)

      This snippet is expected to print "hello" as well (at least it's what comment in cpython implementation suggests)

      https://github.com/python/cpython/blob/master/Objects/descrobject.c#L1712-L1715

    4. ezio-melotti
      transferred this issue fromon Apr 10, 2022
    5. AlexWaygood
      added
      type-featureA feature request or enhancement
      on Apr 10, 2022
    6. JelleZijlstra
      closed this as completedin 66f5addon May 29, 2022
    7. youknowone
      added a commit that references this issue on May 1, 2024

      bpo-41287: Handle `doc` argument of `property.__init__` in subclasses (…

      66f5add
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