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Don't needlessly change refcounts of dummy objects for sets #62997

Description

@rhettinger
BPO 18797
Nosy @tim-one, @rhettinger, @pitrou, @markshannon
Files
  • no_refcnt_dummy1.diff: Use #ifdefs to remove dummy object refcount changes
  • no_refcnt_dummy2.diff: Version without #ifdef
  • 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 2013-08-22.16:01:38.849>
    created_at = <Date 2013-08-21.07:55:45.530>
    labels = ['interpreter-core', 'performance']
    title = "Don't needlessly change refcounts of dummy objects for sets"
    updated_at = <Date 2013-08-22.16:01:38.848>
    user = 'https://github.com/rhettinger'

    bugs.python.org fields:

    activity = <Date 2013-08-22.16:01:38.848>
    actor = 'rhettinger'
    assignee = 'none'
    closed = True
    closed_date = <Date 2013-08-22.16:01:38.849>
    closer = 'rhettinger'
    components = ['Interpreter Core']
    creation = <Date 2013-08-21.07:55:45.530>
    creator = 'rhettinger'
    dependencies = []
    files = ['31394', '31402']
    hgrepos = []
    issue_num = 18797
    keywords = ['patch']
    message_count = 4.0
    messages = ['195751', '195753', '195810', '195904']
    nosy_count = 5.0
    nosy_names = ['tim.peters', 'rhettinger', 'pitrou', 'Mark.Shannon', 'python-dev']
    pr_nums = []
    priority = 'normal'
    resolution = 'fixed'
    stage = None
    status = 'closed'
    superseder = None
    type = 'performance'
    url = 'https://bugs.python.org/issue18797'
    versions = ['Python 3.4']

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      interpreter-core(Objects, Python, Grammar, and Parser dirs)performancePerformance or resource usage

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