python / python/cpython

Improve error messages for non-matching `elif`/`else` statements

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interpreter-core topic-parser type-feature
Dominant language
Python
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Description

BPO 45759
Nosy @aroberge, @lysnikolaou, @pablogsal, @AlexWaygood, @thatbirdguythatuknownot
PRs
  • python/cpython#29481
  • python/cpython#29513
  • python/cpython#29775
  • 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 2021-11-08.23:51:38.287>
    labels = ['interpreter-core', 'type-bug', '3.10', '3.11']
    title = 'Improve error messages for non-matching `elif`/`else` statements'
    updated_at = <Date 2021-11-25.12:15:15.681>
    user = 'https://github.com/thatbirdguythatuknownot'
    

    bugs.python.org fields:

    activity = <Date 2021-11-25.12:15:15.681>
    actor = 'Crowthebird'
    assignee = 'none'
    closed = False
    closed_date = None
    closer = None
    components = ['Parser']
    creation = <Date 2021-11-08.23:51:38.287>
    creator = 'Crowthebird'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 45759
    keywords = ['patch']
    message_count = 2.0
    messages = ['405990', '405997']
    nosy_count = 5.0
    nosy_names = ['aroberge', 'lys.nikolaou', 'pablogsal', 'AlexWaygood', 'Crowthebird']
    pr_nums = ['29481', '29513', '29775']
    priority = 'normal'
    resolution = None
    stage = 'patch review'
    status = 'open'
    superseder = None
    type = 'behavior'
    url = 'https://bugs.python.org/issue45759'
    versions = ['Python 3.10', 'Python 3.11']
    

    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 Parser component and review PRs #29481, #29513, and #29775 to understand the proposed handling of non-matching elif/else statements. The work is done when these cases produce improved, more specific error messages and the existing parser behavior remains correct.

    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
    Mostly clear
    Newbie friendliness
    25/100

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