join v.s. +=

gistfile1.py

import timeit

#STRING = 'addddddeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeewweeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeffffffffffffffffffffffffffffffffffffffffffffffffffffffffeeeeeeeeeeeeeeeeeeeeeeeeeerwerwerwerwetrwegfsghklujsahdflkiuahfgluhewihrlwelfhlwuhfawhrgfiuhagrliwrwreqwerqwerwefsdfasdfasdfasdfdsfddddddddddddddddeeeeeeeewwwwwwwwwwwwwddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd'
STRING = 'sss'
LOOP = 1000000
TIMEIT_REPEAT = 30


def test_join():
    data = []
    for i in range(LOOP):
        data.append(STRING)
    return ''.join(data)


def test_connect():
    data = ""
    for i in range(LOOP):
        data += STRING
    return data


print 'join :', timeit.timeit(test_join, number=TIMEIT_REPEAT)
print ' +=  :', timeit.timeit(test_connect, number=TIMEIT_REPEAT)