Bill Janssen wrote: >> There are basically two ways for a system, such as a >> Python function, to indicate 'I cannot give a normal response." One (1a) >> is to give an inband signal that is like a normal response except that it >> is not (str.find returing -1). A variation (1b) is to give an inband >> response that is more obviously not a real response (many None returns). >> The other (2) is to not respond (never return normally) but to give an >> out-of-band signal of some sort (str.index raising ValueError). >> >> Python as distributed usually chooses 1b or 2. I believe str.find and >> .rfind are unique in the choice of 1a. > > Doubt it. The problem with returning None is that it tests as False, > but so does 0, which is a valid string index position.
Heh. You know what the Perl6 folks would suggest in this case? return 0 but true; # literally! > Might add a boolean "str.contains()" to cover this test case. There's already __contains__. Reinhold -- Mail address is perfectly valid! _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
