[issue7447] Sum() doc and behavior mismatch

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> 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). 'Param = default' merely means that the parameter has a default argument and it is therefore optional to provide one. It says nothing about whether the argument can be identified by the parameter name or only by position.

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