[issue36491] sum function's start optional parameter documented in help but not implemented

[Stefan Behnel]

Stefan Behnel <stefan_ml at behnel.de> added the comment:

It's currently implemented as a positional argument, not a keyword argument. Thus the "/" at the end of the signature in the help text. That also suggests that it was a conscious decision, not an oversight. Personally, I'd also prefer it if it was available as a keyword argument.

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nosy: +scoder

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<https://bugs.python.org/issue36491>
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