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[Python-Dev] Positional-only parameters in Python

On 01/19/2018 08:47 PM, Nick Coghlan wrote:
> - proposing the full PEP 547, including the "argument groups" feature
> (which is a bigger change, but allows the expression of signatures
> like "range([start,] stop, [step,] /)")

I hope we don't go down that route.

I added support for "argument groups" to Argument Clinic in an attempt 
to support legacy functions with crazy argument signatures that count 
their arguments.? (For example, curses.window.overlay() takes either one 
or seven arguments exactly--not two!, and not six!.)? I have deeply 
mixed feelings about the result, and I would hate to see support for it 
added to the language.? If I had my way I'd rewrite or replace those 
functions and have only modern Pythonic signatures in the standard library.

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