(a==b) ? 'Yes' : 'No'
in [Python]
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From: Joaquin Abian on 30 Mar 2010 12:57 On Mar 30, 5:40 pm, gentlestone <tibor.b...(a)hotmail.com> wrote: > Hi, how can I write the popular C/JAVA syntax in Python? > > Java example: > return (a==b) ? 'Yes' : 'No' > > My first idea is: > return ('No','Yes')[bool(a==b)] > > Is there a more elegant/common python expression for this? (a==b) and 'YES' or 'NO' Yes, ugly Joaquin
From: Robert Kern on 30 Mar 2010 12:58 On 2010-03-30 12:08 PM, John Nagle wrote: > Chris Rebert wrote: >> On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.beck(a)hotmail.com> >> wrote: >>> Hi, how can I write the popular C/JAVA syntax in Python? >>> >>> Java example: >>> return (a==b) ? 'Yes' : 'No' >>> >>> My first idea is: >>> return ('No','Yes')[bool(a==b)] >>> >>> Is there a more elegant/common python expression for this? >> >> Yes, Python has ternary operator-like syntax: >> return ('Yes' if a==b else 'No') >> >> Note that this requires a recent version of Python. > > Who let the dogs in? That's awful syntax. http://www.python.org/dev/peps/pep-0308/ -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco
From: Steven D'Aprano on 30 Mar 2010 13:09 On Tue, 30 Mar 2010 08:40:56 -0700, gentlestone wrote: > Hi, how can I write the popular C/JAVA syntax in Python? > > Java example: > return (a==b) ? 'Yes' : 'No' > > My first idea is: > return ('No','Yes')[bool(a==b)] You don't need the call to bool. ('No','Yes')[a==b] > Is there a more elegant/common python expression for this? The above is pretty elegant to my eyes, but you can also do: return 'Yes' if a==b else 'No' -- Steven
From: Steven D'Aprano on 30 Mar 2010 13:11 On Tue, 30 Mar 2010 10:08:31 -0700, John Nagle wrote: >> Yes, Python has ternary operator-like syntax: return ('Yes' if a==b >> else 'No') >> >> Note that this requires a recent version of Python. > > Who let the dogs in? That's awful syntax. I used to think so to, but now I like it. It matches common English syntax like: "I'm going to the movies tonight, if I leave the office early, otherwise I'll stay home and nitpick on Usenet." -- Steven
From: Steve Holden on 30 Mar 2010 13:56
John Nagle wrote: > Chris Rebert wrote: >> On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.beck(a)hotmail.com> >> wrote: >>> Hi, how can I write the popular C/JAVA syntax in Python? >>> >>> Java example: >>> return (a==b) ? 'Yes' : 'No' >>> >>> My first idea is: >>> return ('No','Yes')[bool(a==b)] >>> >>> Is there a more elegant/common python expression for this? >> >> Yes, Python has ternary operator-like syntax: >> return ('Yes' if a==b else 'No') >> >> Note that this requires a recent version of Python. > > Who let the dogs in? That's awful syntax. > Yes, that's deliberately awful syntax. Guido designed it that way to ensure that people didn't aver-use it, thereby reducing the readability of Python applications. Speaking purely personally I hardly ever use it, but don't dislike it. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 See PyCon Talks from Atlanta 2010 http://pycon.blip.tv/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS: http://holdenweb.eventbrite.com/ |