Yanghao Hua wrote:
Did Guido say "user defined syntax" or "user defined operator"?
> ... for me defining new operator is different
To my mind it's not that much different. A reader encountering an unfamiliar operator is pretty much faced with a new piece of syntax to learn. Its spelling gives little to no clue as to its meaning, it precedence in relation to other operators is not obvious, etc.
The way scala allows user to define new operator is really elegant,
There are some differences between Python and Scala that present practical difficulties here. Some kind of declaration would be needed to define its arity, precedence and corresponding dunder method. This is no problem in Scala because it analyses imported code at compile time. But the Python compiler only sees the module being compiled, so it has no ability to import these kinds of declarations from another module. Plus, the way the parser works would probably have to be completely redesigned. So anyone suggesting user-defined operators be added to Python has to both convince the community that it's a good idea in the first place, and come up with solutions to all the technical problems. -- Greg _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
