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Various things in stdlib could benefit from the plugin system #3541

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Various things in stdlib could benefit from the plugin system#3541
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featurepriority-1-normaltopic-pluginsThe plugin API and ideas for new plugins

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@JukkaL
JukkaL
opened on Jun 14, 2017

These ideas are from #1240:

  • re.findall
  • sys.exc_info
  • The built-in function pow (not math.pow)
  • universal_newlines and subprocess.Popen
  • dict(key=value) and dict.update with keyword arguments (the prior is currently special cased without a plugin)
  • sum (works for anything that supports +)
  • Parts of itertools and functools
  • struct (could infer type from format string)

Activity

  1. JukkaL
    added
    feature
    priority-1-normal
    topic-pluginsThe plugin API and ideas for new plugins
    on Jun 14, 2017

  2. ilevkivskyi commented on Jun 14, 2017

    @ilevkivskyi
    ilevkivskyi
    on Jun 14, 2017
    Member

    sum (works for anything that supports +)

    I would rather try supporting this by adding a protocol like Addable, (maybe also Comparable for sorted in Python 3). If that will not work, then this can be done using a plugin, but Addable and Comparable may be useful on their own.

  3. JukkaL commented on Jun 14, 2017

    @JukkaL
    JukkaL
    on Jun 14, 2017
    CollaboratorAuthor

    Addable and Comparable may be hard to support in full generality. The complex semantics of reverse operator methods such as __add__ vs. __radd__ are one factor. When I looked at this earlier I came up with some tricky-looking corner cases but I can't remember all the details any more.

  4. ilevkivskyi commented on Jun 15, 2017

    @ilevkivskyi
    ilevkivskyi
    on Jun 15, 2017
    Member

    I would add better support for enum to the list, see for example #3546
    Or are we going to continue special casing Enum directly in code?

  5. JukkaL commented on Jun 15, 2017

    @JukkaL
    JukkaL
    on Jun 15, 2017
    CollaboratorAuthor

    It's not a priority to get rid of the existing special casing for enum, but it would be better to use the plugin system for new features whenever possible. In the long term it may make sense to use a plugin for all or most of enum functionality.

  6. ilevkivskyi commented on Aug 29, 2017

    @ilevkivskyi
    ilevkivskyi
    on Aug 29, 2017
    Member

    Here is an example where plugin for itertools.product will be useful: #3884

  7. hauntsaninja commented on Oct 31, 2021

    @hauntsaninja
    hauntsaninja
    on Oct 31, 2021
    Collaborator

    Closing because stale / protocols and literals. #7803 would be useful though!

  8. hauntsaninja
    closed this as completedon Oct 31, 2021
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