map is useless!

[Alain Ketterlin]

rantingrick <rantingrick at gmail.com> writes:

> Python map is just completely useless. [...]

>>>> import time
>>>> def test1():
> 	l = range(10000)
> 	t1 = time.time()
> 	map(lambda x:x+1, l)
> 	t2= time.time()
> 	print t2-t1
>>>> def test2():
> 	l = range(10000)
> 	t1 = time.time()
> 	for x in l:
> 		x + 1
> 	t2 = time.time()
> 	print t2-t1
>
>>>> test1()
> 0.00200009346008
>>>> test2()
> 0.000999927520752
>>>> def test3():

Well, not building the resulting list saves some time. But even if you
do r.append(x+1) map appears to be slower...

Try this:

def test3():
    l = range(10000)
    t1 = time.time()
    [ x+1 for x in l]
    t2 = time.time()
    print t2-t1

I've not used map since I learned about list comprehensions.

-- Alain.