Compare timing of list comprehension versus naive

lc-timeit.py

def foo(n):
    a = []
    for i in range(n):
        a.append(i * 2)
    return a

def bar(n):
    return [i * 2 for i in range(n)]

>>> import timeit
>>> timeit.timeit('bar(100)', setup='from __main__ import bar')
3.6985809803009033
>>> timeit.timeit('foo(100)', setup='from __main__ import foo')
5.85391902923584
>>> timeit.timeit('bar(1000)', setup='from __main__ import bar')
34.762638092041016
>>> timeit.timeit('foo(1000)', setup='from __main__ import foo')
58.36402416229248