python string concat test

#!/usr/bin/env python
# -*- coding: utf-8 -*-
from cStringIO import StringIO
from UserString import MutableString

data = xrange(100000)

def test_naive_way():
    accum = ''
    for x in data:
        accum += str(x)

    return accum


def test_join_way():
    return ''.join([str(x) for x in data])


def test_generator_join_way():
    return ''.join((str(x) for x in data))


def test_join_for_way():
    accum = []
    for x in data:
        accum.append(str(x))

    return ''.join(accum)


def _test_mutable_way():
    accum = MutableString()
    for x in data:
        accum += str(x)

    return accum


def test_stringio_way():
    f = StringIO()
    for x in data:
        f.write(str(x))
    return f.getvalue()


if __name__ == '__main__':
    from timeit import Timer
    itercnt = 1000
    expression = "%s()"
    impst = "from __main__ import %s, StringIO, data, MutableString"
    funcs = [x for x in globals().keys() if x.startswith('test_')]
    for f in funcs:
        t = Timer(expression % f, impst % f)
        print f, t.timeit(itercnt)


"""
% python stringcat.py 
test_join_for_way 47.743074894
test_generator_join_way 42.0865740776
test_naive_way 36.9351909161
test_join_way 40.2822668552
test_stringio_way 50.0085318089

"""