What's the Pythonic way to do this?

Peter Hansen peter at engcorp.com
Fri Sep 10 22:50:19 CEST 2004


Doug Rosser wrote:
> class Cycle(object):
> 
>     def __init__(self, inputList):
>         object.__init__(self)
>         self.index = 0
>         self.limit = len(inputList)
>         self.list = inputList
> 
>     def next(self):
>         """
>         returns the next element of self.list, jumping
>         back to the head of the list if needed.
>         Yes, this is an infinite loop. (Use with caution)
>         Arguments:
>             none
>         Returns:
>             the next element of self.list
>         """
>         if self.index+1 < self.limit:
>             self.index+=1
>             return self.list[self.index-1]
>         else:
>             self.index=0
>             return self.list[self.limit-1]

I think this is spelled like this now:

import itertools
mycycle = itertools.cycle(inputList)

-Peter



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