So, there is a difference between None and False, is that the issue? I don’t necessarily see the difference as stated in the subject line.
A=True If A == True If A Is this the crux of the issue? BTW, the feedback to my submittal suggests that this is a difference with no distinction. Clayton From: wesley chun [mailto:wes...@gmail.com] Sent: Monday, November 10, 2014 11:35 PM To: c...@godblessthe.us Cc: Ben Finney; tutor Subject: Re: [Tutor] “has a value of True” versus “evaluates true” (was: don't understand iteration) good catch, and definitely a distinction beginners should be more cognizant of. it's also good to recognize that a call to "bool(match)" would render that statement correct, as the built-in/factory function will return what an object evaluates to (True [re.match object] or/vs.False [None]). On Mon, Nov 10, 2014 at 5:31 PM, Clayton Kirkwood <c...@godblessthe.us> wrote: I reported it. I feel all grown up now. Kind of like one of the boys(girls...) Clayton:<) >-----Original Message----- >From: Tutor [mailto:tutor-bounces+crk <mailto:tutor-bounces%2Bcrk> >=godblessthe...@python.org] On >Behalf Of Ben Finney >Sent: Monday, November 10, 2014 3:24 PM >To: tutor@python.org >Subject: [Tutor] “has a value of True” versus “evaluates true” (was: >don't understand iteration) > >"Clayton Kirkwood" <c...@godblessthe.us> writes: > >> Also of confusion, the library reference says: >> >> Match objects always have a boolean value of True. Since match() and >> search() return None when there is no match, you can test whether >> there was a match with a simple if statement: >> >> match = re.search(pattern, string) >> if match: >> process(match) > >The documentation is incorrect, as you point out: “have a boolean value >of True” implies that the value is identical to the built-in ‘True’ >constant, which is never the case for these objects. > >Instead, the passage above should say “evaluates true in a boolean >context”. > >Would you be so kind as to report a bug to that effect ><URL:http://bugs.python.org/>? > >-- > \ “The Vatican is not a state.… a state must have people. There | > `\ are no Vaticanians.… No-one gets born in the Vatican except by | >_o__) an unfortunate accident.” —Geoffrey Robertson, 2010-09-18 | >Ben Finney > >_______________________________________________ >Tutor maillist - Tutor@python.org >To unsubscribe or change subscription options: >https://mail.python.org/mailman/listinfo/tutor _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "A computer never does what you want... only what you tell it." +wesley chun <http://google.com/+WesleyChun> : wescpy at gmail : @wescpy <http://twitter.com/wescpy> Python training & consulting : http://CyberwebConsulting.com "Core Python" books : http://CorePython.com Python blog: http://wescpy.blogspot.com
_______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
