Re: How to efficiently proceed addition and subtraction in pythonlist?
Steve Holden wrote: And statements like that are probably going to annoy me ;-) t = timeit.Timer(b = map(lambda x: x-1, a), setup=a=[1,2,3]) t.timeit() 2.4686168214116599 t = timeit.Timer(b = [x-1 for x in a], setup=a=[1,2,3]) t.timeit() 0.9930245324475635 And now someone's probably reading this and thinking that list comprehensions are *always* faster than map... /F -- http://mail.python.org/mailman/listinfo/python-list
Re: How to efficiently proceed addition and subtraction in pythonlist?
Fredrik Lundh wrote: Steve Holden wrote: And statements like that are probably going to annoy me ;-) t = timeit.Timer(b = map(lambda x: x-1, a), setup=a=[1,2,3]) t.timeit() 2.4686168214116599 t = timeit.Timer(b = [x-1 for x in a], setup=a=[1,2,3]) t.timeit() 0.9930245324475635 And now someone's probably reading this and thinking that list comprehensions are *always* faster than map... You are so right. So, let me repeat the important part that Fredrik didn't quote: if performance is *really* important, you need to benchmark both options regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden -- http://mail.python.org/mailman/listinfo/python-list
Re: How to efficiently proceed addition and subtraction in pythonlist?
Steve Holden wrote: Fredrik Lundh wrote: Steve Holden wrote: ... if performance is *really* important, you need to benchmark both options Fair point. -- http://mail.python.org/mailman/listinfo/python-list
