[issue34637] Make *start* usable as a keyword argument for sum().

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

I suggest also allowing the first argument to be a keyword named sequence= as well.  (along the philosophy of positional only arguments on APIs that happen to be implemented in C in CPython are a bad legacy)

pypy already uses these names:
 https://bitbucket.org/pypy/pypy/src/4cbeaa8bf545332c36ae277019772aa432693e4c/pypy/module/__builtin__/app_functional.py?at=default&fileviewer=file-view-default#app_functional.py-41

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<https://bugs.python.org/issue34637>
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