[New-bugs-announce] [issue35158] Fix PEP 3115 to NOT imply that the class dictionary is used in the final created class

[Joy Diamond]

New submission from Joy Diamond <python.gem at gmail.com>:

Fix the following in https://www.python.org/dev/peps/pep-3115/

REPLACE:

    """
    def __new__(cls, name, bases, classdict):
        # Note that we replace the classdict with a regular
        # dict before passing it to the superclass, so that we
        # don't continue to record member names after the class
        # has been created.
        result = type.__new__(cls, name, bases, dict(classdict))
        result.member_names = classdict.member_names
        return result
    """

WITH:

    """
    def __new__(cls, name, bases, classdict):
        result = type.__new__(cls, name, bases, classdict)
        result.member_names = classdict.member_names
        return result
    """

REMOVING the incorrect comment & copying of `classdict`

According to: https://docs.python.org/3/reference/datamodel.html#preparing-the-class-namespace

"When a new class is created by type.__new__, the object provided as the namespace parameter is copied to a new ordered mapping and the original object is discarded."

Hence there is no need to copy `classdict`

----------
messages: 329213
nosy: joydiamond
priority: normal
severity: normal
status: open
title: Fix PEP 3115 to NOT imply that the class dictionary is used in the final created class

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35158>
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