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switch case with range - Printable Version

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switch case with range - jun - Feb-26-2019

I'm new to python and working on some homework.

def letter(i):
    switcher={
            0:'a',
            1:'b',
            2:'c'
            }
    return switcher.get(i,"Invalid")
Output:
letter(0) -> 'a'
letter(2) -> 'c'
letter(3) -> 'Invalid'
Can I use a range in the case#? something like below, I tried different ways but didn't work.
            0:'a',
            1:'b',
         2..5:'c'
I also tried 

range(2,5):'c'


didn't work.

Is there easy way to do that?

Thanks,

RE: switch case with range - scidam - Feb-26-2019

It seems that you are using Python 2.x, since range(2, 5) isn't hashable and doesn't work.
Switch to Python 3.x (better), or use xrange instead.

RE: switch case with range - ichabod801 - Feb-27-2019

(Feb-26-2019, 11:04 PM)scidam Wrote: It seems that you are using Python 2.x, since range(2, 5) isn't hashable and doesn't work.
Switch to Python 3.x (better), or use xrange instead.

That won't work, because 3 != range(2, 5).

To OP, if you want that to work, you have to put all of the numbers in the dictionary. Those are keys to a hash map, not a switch statement. I would just code that with if/elif:

if i == 0:
   return 'a'
elif i == 1:
   return 'b'
elif 2 <= i < 5:
   return 'c'
Only in a much more complicated case would I use a dictionary (or maybe a list or string), but as I said, you would have to put every 'case' in as a separate key.

RE: switch case with range - scidam - Feb-27-2019

Sorry for misleading, I just pointed out that range could be a key of a dictionary in python 3.x.