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Wed Jan 17 11:29:16 EST 2018 · https://mail.python.org/pipermail/python-dev/2018-January/151799.html

On 01/17/2018 08:14 AM, Serhiy Storchaka wrote:
> 17.01.18 16:34, Victor Stinner пише:
>> In Februrary 2017, I proposed on python-ideas to change the Python
>> syntax to allow to declare positional-only parameters in Python:
>>
>> https://mail.python.org/pipermail/python-ideas/2017-February/044879.html
>> https://mail.python.org/pipermail/python-ideas/2017-March/044956.html
>
> The main problem -- designing a syntax that does not look ugly. I
 > think there are too small time is left before features freezing for
 > experimenting with it. It would be better to make such changes at the
 > early stage of development.

The syntax question is already solved:

    def some_func(a, b, /, this, that, *, the_other):
        # some stuff

Everything before the slash is positional-only, between the slash and star is positional-or-keyword, and after the star 
is keyword-only.  This is what is in our generated help(), and there is a nice symmetry between '/' and '*' being 
opposites, and positional/keyword being opposites.  And slash is certainly no uglier than star.  ;)

--
~Ethan~

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[Python-Dev] Positional-only parameters in Python