[Python-3000] have zip() raise exception for sequences of different lengths

Raymond Hettinger rhettinger at ewtllc.com
Wed Aug 30 23:52:54 CEST 2006

Steven Bethard wrote:

>A couple Python-3000 threads [1] [2] have indicated that the most
>natural use of zip() is with sequences of the same lengths.  I feel
>the same way, and run into this all the time.  Because the error would
>otherwise pass silently, I usually end up adding checks before each
>use of zip() to raise an exception if I accidentally pass in sequences
>of different lengths.
>Any chance that zip() in Python 3000 could automatically raise an
>exception if the sequence lengths are different?  If there's really a
>need for a zip that just truncates, maybe that could be moved to
>itertools?  I think the equal-length scenario is dramatically more
>common, and keeping that error from passing silently would be a good
>thing IMHO.
 I think this would cause much more harm than good and wreck an 
otherwise easy-to-understand tool.


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