On Friday 03 June 2011, it occurred to Tim Delaney to exclaim: > Probably the biggest savings are list creating and jumping between C- and > Python-functions during the map call. The lambda is a Python function, > which are notoriously slow to use from within map() in comparison to > keeping it all as C-level. Creating intermediate lists is totally > unnecessary and obviously a waste of time. You're actually creating 3 > intermediate lists - one with map(), one with zip() and one with range() > (the third only if this is Python 2.x code, not 3.x).
Actually, in Python 3, map and zip also return iterators, so I would expect the two versions to be almost the same speed in Python 3. The Python function call is of course still slow. -TJ
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