On Fri, Jul 31, 2009 at 12:27 PM, Che M<pine...@hotmail.com> wrote: > > >> To: tutor@python.org >> From: alan.ga...@btinternet.com >> Date: Fri, 31 Jul 2009 17:09:48 +0100 >> Subject: Re: [Tutor] mnemonics to better learn Python >> >> >> "Eduardo Vieira" <eduardo.su...@gmail.com> wrote >> >> > Hello, would anybody have a good memorization technique for boolean >> > results? Like when using 'or'/'and' what it returns when both are >> > false, the last is false, etc? >> >> Hmm, I don't try to remember those, I just work it out based on >> the meaning. >> >> A and B is true only if both A and B are True >> A or B is true if either A or B is True. >> >> Thats it really, what's to remember? > > I tend to agree, but since he asked for a mnemonic... > > What Python Needs to Return a Boolean > AND: Both I demand! > OR: One or more. > > So, > > if A and B are False: > [think "Both I demand...are False") > if A or B are False: > [think "One or more...are False") > if A and B are True: > [think "Both I demand...are True") > etc. > > Che > > > ________________________________ > Windows Live™ SkyDrive™: Store, access, and share your photos. See how. > _______________________________________________ > Tutor maillist - tu...@python.org > http://mail.python.org/mailman/listinfo/tutor > > It's not that it's so hard, but I still have to stop and think for a while... "humm, how's that?" Like in the IDLE 2 and 4 and 0 Result: 0 2 and 4 and 5 Result: 5 2 and 0 and 6 Result: 0 So, what I need to memorize is that with AND, if there's a false item, then that false is returned, otherwise the last one is returned With OR, the first one is returned if true, otherwise, the next "true" value is returned 2 or 3 or 0 Result: 2 2 or 0 or 3 Result: 2 0 or 2 or 3 Result: 2 0 or '' or 4 Result: 4
Do you see how this can demand a little more of brainwork? Eduardo _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
