Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

It is hard to find a builtin which could be easy and clearly implemented in 
Python (it means no use of dunder methods). Maybe sorted()?

def sorted(iterable, /, *, key=None, reverse=False):
    """Emulate the built in sorted() function"""
    result = list(iterable)
    result.sort(key=key, reverse=reverse)
    return result

Although I think that this use case is less important. The primary goal of the 
feature is mentioned at the end of the section -- easy way to implement 
functions which accept arbitrary keyword arguments.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38237>
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