def setup():
	global a_list
	a_list = [" raz sada ra r era kldfa d dh dsfh fhds h aergl jlk     "]*500

def slice_comprehension():
	global a_list
	a_list[:] = (s.strip() for s in a_list)

def noslice_comprehension():
	global a_list
	a_list = [s.strip() for s in a_list]

def slice_map():
	global a_list
	a_list[:] = map(str.strip, a_list)

def noslice_map():
	global a_list
	a_list = map(str.strip, a_list)

def iter_enumerate():
	global a_list
	for i,x in enumerate(a_list):
		a_list[i] = x.strip()

def iter_range():
	global a_list
	for i in range(len(a_list)):
		a_list[i] = a_list[i].strip()

def iter_manual():
	global a_list
	i=0
	for x in a_list:
		a_list[i] = x.strip()
		i+=1

import timeit
n=1000
funcs = slice_comprehension, noslice_comprehension, slice_map, noslice_map, iter_enumerate, iter_range, iter_manual
values = [(f.func_name, timeit.timeit(f, number=n, setup=setup)) for f in funcs]
for i in sorted(values, key=lambda x: x[1]):
	print "{:25}: {}".format(*i)