Hi Kent, So if I undestand you right, mapping a function with map() when it is a built-in function will/may be faster than a for loop, but if it's a custom function (ie. a def one), it will most likely be slower?
Thanks Bernard On 5/13/05, Kent Johnson <[EMAIL PROTECTED]> wrote: > Bernard Lebel wrote: > > The authors even go as far as saysing, on page 228 (first paragraph) > > that map() used that way has a performance benefit and is faster than > > a for loop. > > That may well be correct, at least in the case where the function passed to > map is a builtin. > Mapping a builtin to over a list is extremely fast. So write the code with a > for loop so it is > clear. When you identify a performance bottleneck you can try rewriting your > loop using map or list > comprehension, which is also fast. Until then it is premature optimization. > For typical loops over a > small number of items I can't imagine you would notice the difference. > > Kent > > _______________________________________________ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
