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python string concat test

#!/usr/bin/env python
import time

data = range(10000000)

def test_method(method):
    start_time = time.time()
    result = method()
    assert len(result) == 68888890, 'Method work no good: %s != 68888890' % len(result)
    end_time = time.time()

    print method.func_name, end_time - start_time


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

    return accum 
        

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

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

    return ''.join(accum)
    

from UserString import MutableString
def mutable_way():
    accum = MutableString()
    for x in data:
        accum += str(x)

    return accum

from cStringIO import StringIO
def stringio_way():
    f = StringIO()
    for x in data:
        f.write(str(x))
    return f.getvalue()


test_method(naive_way)
test_method(join_way)
test_method(join_for_way)
#test_method(mutable_way)
test_method(stringio_way)