[BangPypers] Are comprehensions faster?

Senthil Kumaran orsenthil at gmail.com
Mon Feb 9 14:41:12 CET 2009

On Mon, Feb 9, 2009 at 7:06 PM, Senthil Kumaran <orsenthil at gmail.com> wrote:
>>>> timeit.Timer("for i in range(1000): l.append(i)","l=[]").timeit(number=1000)
> 0.21927285194396973
> You see that is slow and the reason is  l.append being called again
> and again. lets eliminate it.

Sorry, it is slow because the append method "Look-up" on the list
object is done again and again.

Read further. Rest of my explanation is okay.


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