python / python/cpython

Using LazyLoader leads to AttributeError

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3.10 3.8 (EOL) 3.9 (EOL) interpreter-core type-bug
Dominant language
Python
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Description

BPO 42273
Nosy @ncoghlan, @ericsnowcurrently, @E-Paine
Files
  • lazy_import.zip: Files needed to reproduce issue
  • 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 2020-11-05.22:14:23.801>
    labels = ['interpreter-core', 'type-bug', '3.8', '3.9', '3.10']
    title = 'Using LazyLoader leads to AttributeError'
    updated_at = <Date 2020-11-12.20:41:25.594>
    user = 'https://bugs.python.org/KevKeating'
    

    bugs.python.org fields:

    activity = <Date 2020-11-12.20:41:25.594>
    actor = 'brett.cannon'
    assignee = 'none'
    closed = False
    closed_date = None
    closer = None
    components = ['Interpreter Core']
    creation = <Date 2020-11-05.22:14:23.801>
    creator = 'KevKeating'
    dependencies = []
    files = ['49574']
    hgrepos = []
    issue_num = 42273
    keywords = []
    message_count = 10.0
    messages = ['380437', '380513', '380617', '380618', '380694', '380718', '380719', '380720', '380844', '380848']
    nosy_count = 4.0
    nosy_names = ['ncoghlan', 'eric.snow', 'KevKeating', 'epaine']
    pr_nums = []
    priority = 'normal'
    resolution = None
    stage = 'resolved'
    status = 'open'
    superseder = None
    type = 'behavior'
    url = 'https://bugs.python.org/issue42273'
    versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']
    

    Contributor guide

    Open the contributing guide

    First steps

    1. Read the whole issue, then the project's contributing guide.
    2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
    3. Fork the repository and make your change on a branch.
    4. Open a pull request that references the issue number.

    Research direction

    Start with the attached lazy_import.zip and reproduce the AttributeError described in the issue. Trace the LazyLoader behavior in the Python interpreter and verify that the reproducer no longer raises the error on the affected Python 3.8, 3.9, and 3.10 versions.

    Written by the indexing model from the issue text.

    Assessment

    Tech stack
    python
    Domain
    compilers
    Issue type
    Bug
    Difficulty
    4/5
    Estimated time
    3-5 days
    Activity status
    Stale
    Clarity
    Needs clarification
    Newbie friendliness
    35/100

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