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pprint: added support for mapping proxy #67690

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serhiy-storchaka opened this issue Feb 23, 2015 · 2 comments
Closed

pprint: added support for mapping proxy #67690

serhiy-storchaka opened this issue Feb 23, 2015 · 2 comments
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stdlib Python modules in the Lib dir type-feature A feature request or enhancement

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@serhiy-storchaka
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BPO 23502
Nosy @freddrake, @rhettinger, @pitrou, @serhiy-storchaka
Files
  • pprint_mappingproxy.patch
    		•

    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/serhiy-storchaka'
closed_at = <Date 2015-03-24.17:33:09.654>
created_at = <Date 2015-02-23.19:21:48.535>
labels = ['type-feature', 'library']
title = 'pprint: added support for mapping proxy'
updated_at = <Date 2015-03-24.17:33:09.653>
user = 'https://github.com/serhiy-storchaka'

    bugs.python.org fields:

    activity = <Date 2015-03-24.17:33:09.653>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2015-03-24.17:33:09.654>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2015-02-23.19:21:48.535>
creator = 'serhiy.storchaka'
dependencies = []
files = ['38215']
hgrepos = []
issue_num = 23502
keywords = ['patch']
message_count = 2.0
messages = ['236460', '239160']
nosy_count = 5.0
nosy_names = ['fdrake', 'rhettinger', 'pitrou', 'python-dev', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue23502'
versions = ['Python 3.5']
    @serhiy-storchaka
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    Mapping proxy is quite often used in building . For example types __dict__ are mapping proxy.

    >>> bool.__dict__
mappingproxy({'__or__': <slot wrapper '__or__' of 'bool' objects>, '__doc__': 'bool(x) -> bool\n\nReturns True when the argument x is true, False otherwise.\nThe builtins True and False are the only two instances of the class bool.\nThe class bool is a subclass of the class int, and cannot be subclassed.', '__xor__': <slot wrapper '__xor__' of 'bool' objects>, '__and__': <slot wrapper '__and__' of 'bool' objects>, '__rxor__': <slot wrapper '__rxor__' of 'bool' objects>, '__repr__': <slot wrapper '__repr__' of 'bool' objects>, '__new__': <built-in method __new__ of type object at 0x82a1140>, '__rand__': <slot wrapper '__rand__' of 'bool' objects>, '__str__': <slot wrapper '__str__' of 'bool' objects>, '__ror__': <slot wrapper '__ror__' of 'bool' objects>})

    Mapping proxy is not a subclass of dict, so pprint doesn't print it pretty. Proposed patch adds support for mapping proxies in pprint.

    >>> from pprint import pprint as pp
>>> pp(bool.__dict__)
mappingproxy({'__and__': <slot wrapper '__and__' of 'bool' objects>,
              '__doc__': 'bool(x) -> bool\n'
                         '\n'
                         'Returns True when the argument x is true, False '
                         'otherwise.\n'
                         'The builtins True and False are the only two '
                         'instances of the class bool.\n'
                         'The class bool is a subclass of the class int, and '
                         'cannot be subclassed.',
              '__new__': <built-in method __new__ of type object at 0x82a1140>,
              '__or__': <slot wrapper '__or__' of 'bool' objects>,
              '__rand__': <slot wrapper '__rand__' of 'bool' objects>,
              '__repr__': <slot wrapper '__repr__' of 'bool' objects>,
              '__ror__': <slot wrapper '__ror__' of 'bool' objects>,
              '__rxor__': <slot wrapper '__rxor__' of 'bool' objects>,
              '__str__': <slot wrapper '__str__' of 'bool' objects>,
              '__xor__': <slot wrapper '__xor__' of 'bool' objects>})

    @serhiy-storchaka serhiy-storchaka added stdlib Python modules in the Lib dir type-feature A feature request or enhancement labels Feb 23, 2015
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    python-dev mannequin commented Mar 24, 2015

    New changeset 646a7e1da7f0 by Serhiy Storchaka in branch 'default':
    Issue bpo-23502: The pprint module now supports mapping proxies.
    https://hg.python.org/cpython/rev/646a7e1da7f0

    @serhiy-storchaka serhiy-storchaka self-assigned this Mar 24, 2015
    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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