On 8/21/19 11:27 AM, Tobiah wrote:
In the docs for itertools.cycle() there is
a bit of equivalent code given:

     def cycle(iterable):
         # cycle('ABCD') --> A B C D A B C D A B C D ...
         saved = []
         for element in iterable:
             yield element
             saved.append(element)
         while saved:
             for element in saved:
                 yield element


Is that really how it works?  Why make
the copy of the elements?  This seems
to be equivalent:


     def cycle(iterable):
         while iterable:
             for thing in iterable:
                 yield thing

You assume that the initial iterable is reusable. If its not, the only way you can go back to the beginning is to have kept track of it yourself.

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Rob Gaddi, Highland Technology -- www.highlandtechnology.com
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