list2str

list2str_benchmark.py

import timeit

def f1(list):
    string = ""
    for item in list:
	string = string + chr(item)
    return string

def f2(list):
    return reduce(lambda string, item: string + chr(item), list, "")

def f3(list):
    string = ""
    for character in map(chr, list):
	string = string + character
    return string

def f4(list):
    string = ""
    lchr = chr
    for item in list:
	string = string + lchr(item)
    return string

def f5(list):
    string = ""
    for i in range(0, 256, 16): # 0, 16, 32, 48, 64, ...
	s = ""
	for character in map(chr, list[i:i+16]):
	    s = s + character
	string = string + s
    return string

import string
def f6(list):
    return string.joinfields(map(chr, list), "")

import array
def f7(list):
    return array.array('B', list).tostring()

def f8(list):
    lchr = chr
    return "".join(lchr(i) for i in list)

def f9(list):
    lchr = chr
    return "".join(map(lchr, list))

if __name__ == '__main__':
    import sys
    try: times = int(sys.argv[1])
    except: times = 1000

    testdata = range(256)
    testfuncs = f1, f2, f3, f4, f5, f6, f7, f8, f9

    for f in testfuncs:
        t = timeit.Timer("%s(%s)"%(f.func_name,testdata), "from __main__ import %s"%f.func_name)
        print f.func_name, t.timeit(times)
        

output.txt

$ python list2str_benchmark.py
f1 0.0816869735718
f2 0.13659119606
f3 0.0807240009308
f4 0.0682158470154
f5 0.103960990906
f6 0.06405210495
f7 0.0222752094269
f8 0.0676648616791
f9 0.065975189209