On Saturday, November 9, 2013 9:26:02 PM UTC+5:30, Roy Smith wrote:
> In article rusi wrote:
> > On Saturday, November 9, 2013 6:38:25 PM UTC+5:30, John von Horn wrote:
> > > Another useful tool in the programmer's toolbox
> > > Select DayofWeek
> > > case "mon"
> > > ...
> > > end select
> > You can typically write this in python as a dictionary
> > cases = {"mon": do_mon-action,
> > "tue", do_tue_action,
> > :
> > :
> > }
> > combined with an 'interpreter'
> > cases[DayofWeek]()
> > Some variants:
> > Need a default?
> > cases.get(DayofWeek, do_default_action)()
> > Sometimes nicer to pass some parameters:
> > cases[DayofWeek](some_relevant_context)
> All of the above is true, but a more straight-forward way to emulate a
> switch/case is with a series of elifs:
> if day_of_week == "mon":
> print "mondays suck"
> elif day_of_week == "tue":
> print "at least it's not monday"
> elif day_of_week == "wed":
> print "humpday!"
> else:
> print "it's some other day"
> I've done both. Both are reasonable translations of switch/case logic
> from other languages.
> The elif chain is more straight-forward to understand, especially for
> somebody new to the language. It also can support more complicated
> selection logic:
Well
print ( {"mon":"mondays suck",
"tue":"at least it's not monday",
"wed":"humpday"
}.get(day_of_week,"its some other day")
)
may be dense
Separate into named dictionary and its ok (I think!)
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