STINNER Victor added the comment:

See also "[Python-ideas] Positional-only parameters" discussion of last March:
https://mail.python.org/pipermail/python-ideas/2017-March/044956.html

Brett Cannon: "It seems all the core devs who have commented on this are in the 
positive (Victor, Yury, Ethan, Yury, Guido, Terry, and Steven; MAL didn't 
explicitly vote). So to me that suggests there's enough support to warrant 
writing a PEP. (...)"

(No, I didn't write such PEP yet :-p)

Maybe we can also enhance the error message to explain that the function 
accepts exactly one positional-only argument?

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30534>
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