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Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10 #83855

@vstinner

Description

@vstinner
BPO 39674
Nosy @gvanrossum, @vstinner, @ezio-melotti, @jamadden, @tirkarthi
PRs
  • bpo-39674: Revert "bpo-25988: Do not expose abstract collection classes in the collections module. (GH-10596)" #18545
  • bpo-39674: Suggest to test with DeprecationWarning #18552
  • bpo-39674: Update collections ABC doc #18747
  • [3.8] bpo-39674: Update collections ABC deprecation doc #18748
  • bpo-39674: Revert "bpo-37330: open() no longer accept 'U' in file mode (GH-16959)" #18767
  • bpo-39674: Fix typo in What's New In Python 3.9 #18776
  • [3.7] Fix collections ABC deprecation notice #25280
  • [3.8] bpo-39674: Fix collections ABC deprecation notice #25281
  • 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 2020-04-23.23:04:03.240>
    created_at = <Date 2020-02-18.11:26:29.040>
    labels = ['3.10', 'expert-unicode']
    title = 'Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10'
    updated_at = <Date 2021-04-08.23:29:27.595>
    user = 'https://github.com/vstinner'

    bugs.python.org fields:

    activity = <Date 2021-04-08.23:29:27.595>
    actor = 'vstinner'
    assignee = 'none'
    closed = True
    closed_date = <Date 2020-04-23.23:04:03.240>
    closer = 'vstinner'
    components = ['Unicode']
    creation = <Date 2020-02-18.11:26:29.040>
    creator = 'vstinner'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 39674
    keywords = ['patch']
    message_count = 13.0
    messages = ['362196', '362220', '362222', '362225', '363195', '363263', '363276', '363277', '363308', '363350', '363367', '367159', '390571']
    nosy_count = 6.0
    nosy_names = ['gvanrossum', 'vstinner', 'ezio.melotti', 'python-dev', 'jmadden', 'xtreak']
    pr_nums = ['18545', '18552', '18747', '18748', '18767', '18776', '25280', '25281']
    priority = 'normal'
    resolution = 'fixed'
    stage = 'resolved'
    status = 'closed'
    superseder = None
    type = None
    url = 'https://bugs.python.org/issue39674'
    versions = ['Python 3.10']

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