python / python/cpython

pyclbr.readmodule_ex traversing "import __main__": dies with ValueError: __main__.__spec__ is None / is not set

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3.13 3.14 3.15 stdlib topic-importlib triaged type-bug
Dominant language
Python
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Description

BPO 43299
Nosy @kxrob, @akulakov
PRs
  • python/cpython#24623
  • 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 2021-02-22.17:48:25.398>
    labels = ['type-bug', 'library', '3.10']
    title = 'pyclbr.readmodule_ex traversing "import __main__": dies with ValueError: __main__.__spec__ is None / is not set'
    updated_at = <Date 2021-07-12.17:42:22.974>
    user = 'https://github.com/kxrob'
    

    bugs.python.org fields:

    activity = <Date 2021-07-12.17:42:22.974>
    actor = 'andrei.avk'
    assignee = 'none'
    closed = False
    closed_date = None
    closer = None
    components = ['Library (Lib)']
    creation = <Date 2021-02-22.17:48:25.398>
    creator = 'kxrob'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 43299
    keywords = ['patch']
    message_count = 7.0
    messages = ['387520', '397054', '397247', '397279', '397280', '397330', '397342']
    nosy_count = 2.0
    nosy_names = ['kxrob', 'andrei.avk']
    pr_nums = ['24623']
    priority = 'normal'
    resolution = None
    stage = 'patch review'
    status = 'open'
    superseder = None
    type = 'behavior'
    url = 'https://bugs.python.org/issue43299'
    versions = ['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 pyclbr.readmodule_ex entry point and reproduce traversal of an import of main, observing the ValueError involving main.spec. Review the linked python/cpython#24623 pull request for the proposed resolution and verify that the issue no longer occurs without changing unrelated module-traversal behavior.

    Written by the indexing model from the issue text.

    Assessment

    Tech stack
    python
    Domain
    tooling
    Issue type
    Bug
    Difficulty
    3/5
    Estimated time
    1-2 days
    Activity status
    Stale
    Clarity
    Mostly clear
    Newbie friendliness
    25/100

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