[Taine Zhao <yaoxiansa...@gmail.com>] > "or" brings an intuition of the execution order of pattern matching, just > like how people already know about "short-circuiting". > > "or" 's operator precedence also suggests the syntax of OR patterns. > > As we have "|" as an existing operator, it seems that there might be > cases that the precedence of "|" is not consistent with it in an > expression. This will mislead users. > > You said "All reuse of symbols carries baggage", I'd say, > > All **inconsistent** reuse of symbols carries baggage, but the > consistent reuse builds good intuitive sense and shows the good > taste of designers.
We're not talking about abstract computation here: this is a specific feature, and "|" is the _only_ infix operator. The PEP considered and rejected "&" and a unary "not", so that's the universe we're left with. With only one "operator", it's really hard to "mislead" ;-) In any case, the model here is far more regular expressions than Python int arithmetic or set unions. "|" means essentially the same thing in the PEP as it does in Python regexps: tru supatterns one at a time, left to right. _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/LH6WUBPBAEPSOAMSB37ZWA2Z2G7X47AB/ Code of Conduct: http://python.org/psf/codeofconduct/
