In article <[email protected]>,
rusi <[email protected]> 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:
elif day_of_week in ['sat', 'sun']:
print "it's the weekend"
John's version is more modular, and lends itself to doing more dynamic
things like passing around sets of actions as function arguments.
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