#!/usr/bin/python -tt

from time import time

LOOPS = 10000

t1 = time()

l1 = []
for x in xrange(LOOPS):
    if x % 2 == 0:
        l1.append(x)

t2 = time()

l2 = [x for x in xrange(LOOPS) if x % 2 == 0]

t3 = time()

l3 = []
append = l3.append
for x in xrange(LOOPS):
    if x % 2 == 0:
        append(x)

t4 = time()

l4 = filter(lambda x: x % 2 == 0, xrange(LOOPS))

t5 = time()

x = lambda x: x % 2 == 0
l5 = filter(x, xrange(LOOPS))

t6 = time()

assert l1 == l2 == l3 == l4 == l5

a = t2 - t1
b = t3 - t2
c = t4 - t3
d = t5 - t4
e = t6 - t5

print 'l1 =', a
print 'l2 =', b, ((a - b) / a) * 100
print 'l3 =', c, ((a - c) / a) * 100
print 'l4 =', d, ((a - d) / a) * 100
print 'l5 =', e, ((a - e) / a) * 100