On 2017-10-26 13:06, Yan Pas wrote: > I've looked up this feature in haskell. Dollar sign operator is used to > avoid parentheses. > > Rationalle: > Python tends to use functions instead of methods ( e.g.len([1,2,3]) > instead of [1,2,3].len() ). Sometimes the expression inside parentheses > may become big and using a lot of parentheses may tend to bad > readability. I suggest the following syntax: > > len $ [1,2,3]
I see absolutely no benefit adding this syntax when we already have a perfectly good function calling syntax. > > Functions map be also chained: > > len $ list $ map(...) Function composition has been discussed at length in the past, e.g. https://mail.python.org/pipermail/python-ideas/2015-May/thread.html#33287 I'd like to highlight one key message: https://mail.python.org/pipermail/python-ideas/2015-May/033491.html Guido van Rossum wrote (May 11, 2015): > As long as I'm "in charge" the chances of this (or anything like it) being > accepted into Python are zero. I get a headache when I try to understand > code that uses function composition, and I end up having to laboriously > rewrite it using more traditional call notation before I move on to > understanding what it actually does. Python is not Haskell, and perhaps > more importantly, Python users are not like Haskel users. Either way, what > may work out beautifully in Haskell will be like a fish out of water in > Python. > > I understand that it's fun to try to sole this puzzle, but evolving Python > is more than solving puzzles. Enjoy debating the puzzle, but in the end > Python will survive without the solution. That old python-ideas thread could be of interest to you. Best Thomas _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/