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Add threading.__excepthook__ similar to sys.__excepthook__ #86474

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mariocj89 mannequin opened this issue Nov 10, 2020 · 5 comments
Closed

Add threading.__excepthook__ similar to sys.__excepthook__ #86474

mariocj89 mannequin opened this issue Nov 10, 2020 · 5 comments
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3.10 only security fixes stdlib Python modules in the Lib dir

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@mariocj89
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Mannequin

mariocj89 mannequin commented Nov 10, 2020

BPO 42308
Nosy @vstinner, @mariocj89
PRs
  • bpo-42308: Add threading.__excepthook__ #23218
  • 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 2020-11-12.17:28:17.661>
    created_at = <Date 2020-11-10.11:09:01.522>
    labels = ['library', '3.10']
    title = 'Add threading.__excepthook__ similar to sys.__excepthook__'
    updated_at = <Date 2020-11-12.17:28:17.660>
    user = 'https://github.com/mariocj89'

    bugs.python.org fields:

    activity = <Date 2020-11-12.17:28:17.660>
    actor = 'vstinner'
    assignee = 'none'
    closed = True
    closed_date = <Date 2020-11-12.17:28:17.661>
    closer = 'vstinner'
    components = ['Library (Lib)']
    creation = <Date 2020-11-10.11:09:01.522>
    creator = 'mariocj89'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 42308
    keywords = ['patch']
    message_count = 5.0
    messages = ['380651', '380663', '380666', '380838', '380839']
    nosy_count = 2.0
    nosy_names = ['vstinner', 'mariocj89']
    pr_nums = ['23218']
    priority = 'normal'
    resolution = 'fixed'
    stage = 'resolved'
    status = 'closed'
    superseder = None
    type = None
    url = 'https://bugs.python.org/issue42308'
    versions = ['Python 3.10']

    @mariocj89
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    mariocj89 mannequin commented Nov 10, 2020

    The sys module contains __excepthook__ to recover sys.excepthook if necessary. The same is not present in the threading module, even if threading.excepthook is exposed.

    @mariocj89 mariocj89 mannequin added 3.10 only security fixes stdlib Python modules in the Lib dir labels Nov 10, 2020
    @vstinner
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    Can't you do that in your own hook? For example:

    orig_hook = threading.excepthook
    threading.excepthook = myhook
    
    def myhook(args):
       try:
          ...
       except:
          print("too bad!")
          orig_hook(args)

    I found one interesting usage of sys.__excepthook__ in code.InteractiveInterpreter:

            if sys.excepthook is sys.__excepthook__:
                lines = traceback.format_exception_only(type, value)
                self.write(''.join(lines))
            else:
                # If someone has set sys.excepthook, we let that take precedence
                # over self.write
                sys.excepthook(type, value, tb)

    So it seems like sys.__excepthook__ is useful ;-)

    @mariocj89
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    mariocj89 mannequin commented Nov 10, 2020

    I found one interesting usage of sys.__excepthook__ in code.InteractiveInterpreter:

    That is exactly what I wished this was there for hehe. We are installing a custom version of excepthook and wanted to check if the user had changed it.

    @vstinner
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    New changeset 750c5ab by Mario Corchero in branch 'master':
    bpo-42308: Add threading.__excepthook__ (GH-23218)
    750c5ab

    @vstinner
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    PR merged, thanks Mario.

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