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traceback.py: Allow customization of per-frame line formatting in StackSummary #88735

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ammaraskar opened this issue Jul 5, 2021 · 2 comments
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3.11 stdlib Python modules in the Lib dir

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@ammaraskar
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ammaraskar commented Jul 5, 2021

BPO 44569
Nosy @terryjreedy, @ammaraskar, @pablogsal, @isidentical
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  • bpo-44569: Decouple frame formatting in traceback.py #27038
  • 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 = 'https://github.com/ammaraskar'
    closed_at = <Date 2021-07-16.12:21:24.792>
    created_at = <Date 2021-07-05.16:47:05.034>
    labels = ['library', '3.11']
    title = 'traceback.py: Allow customization of per-frame line formatting in StackSummary'
    updated_at = <Date 2021-07-16.12:21:24.930>
    user = 'https://github.com/ammaraskar'

    bugs.python.org fields:

    activity = <Date 2021-07-16.12:21:24.930>
    actor = 'pablogsal'
    assignee = 'ammar2'
    closed = True
    closed_date = <Date 2021-07-16.12:21:24.792>
    closer = 'pablogsal'
    components = ['Library (Lib)']
    creation = <Date 2021-07-05.16:47:05.034>
    creator = 'ammar2'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 44569
    keywords = ['patch']
    message_count = 2.0
    messages = ['397009', '397616']
    nosy_count = 4.0
    nosy_names = ['terry.reedy', 'ammar2', 'pablogsal', 'BTaskaya']
    pr_nums = ['27038']
    priority = 'normal'
    resolution = 'fixed'
    stage = 'resolved'
    status = 'closed'
    superseder = None
    type = None
    url = 'https://bugs.python.org/issue44569'
    versions = ['Python 3.11']

    @ammaraskar
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    ammaraskar commented Jul 5, 2021

    During the implementation of PEP-657, Terry Jan Reedy pointed out that in the format method of traceback.StackSummary there are two roles being fulfilled, there is some logic to handle omitting repeated lines involved in recursive calls and then the core per-frame formatting logic:

    cpython/Lib/traceback.py

    Lines 484 to 503 in 17f94e2

    row = []
    row.append(' File "{}", line {}, in {}\n'.format(
    frame.filename, frame.lineno, frame.name))
    if frame.line:
    row.append(' {}\n'.format(frame.line.strip()))
    stripped_characters = len(frame._original_line) - len(frame.line.lstrip())
    if frame.end_lineno == frame.lineno and frame.end_colno != 0:
    colno = _byte_offset_to_character_offset(frame._original_line, frame.colno)
    end_colno = _byte_offset_to_character_offset(frame._original_line, frame.end_colno)
    row.append(' ')
    row.append(' ' * (colno - stripped_characters))
    row.append('^' * (end_colno - colno))
    row.append('\n')
    if frame.locals:
    for name, value in sorted(frame.locals.items()):
    row.append(' {name} = {value}\n'.format(name=name, value=value))
    result.append(''.join(row))

    To allow the per-line formatting to be overridden easily, these lines should be split into a separate method.

    @ammaraskar ammaraskar added the 3.11 label Jul 5, 2021
    @ammaraskar ammaraskar self-assigned this Jul 5, 2021
    @ammaraskar ammaraskar added stdlib Python modules in the Lib dir 3.11 labels Jul 5, 2021
    @ammaraskar ammaraskar self-assigned this Jul 5, 2021
    @ammaraskar ammaraskar added the stdlib Python modules in the Lib dir label Jul 5, 2021
    @pablogsal
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    pablogsal commented Jul 16, 2021

    New changeset 8ce3008 by Ammar Askar in branch 'main':
    bpo-44569: Decouple frame formatting in traceback.py (GH-27038)
    8ce3008

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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