[issue7447] Sum() doc and behavior mismatch

[Łukasz Langa]

Łukasz Langa <lukasz at langa.pl> added the comment:

> For Python functions, all arguments can be keyword arguments. For many builtins, none can be (and maybe there should be a note to that effect at the top of the built-in functions chapter).

+1

Many Python users don't really grasp how builtins are different from regular functions. A note of this kind would be most helpful. Should I provide a patch for Doc/ ?

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