String concatenation benchmarking weirdness

wxjmfauth at gmail.com wxjmfauth at gmail.com
Sat Jan 12 09:38:32 CET 2013


from timeit import timeit, repeat

size = 1000

r = repeat("y = x + 'a'", setup = "x = 'a' * %i" % size)
print('1:', r)
r = repeat("y = x + 'é'", setup = "x = 'a' * %i" % size)
print('2:', r)
r = repeat("y = x + 'œ'", setup = "x = 'a' * %i" % size)
print('3:', r)
r = repeat("y = x + '€'", setup = "x = 'a' * %i" % size)
print('4:', r)
r = repeat("y = x + '€'", setup = "x = '€' * %i" % size)
print('5:', r)
r = repeat("y = x + 'œ'", setup = "x = 'œ' * %i" % size)
print('6:', r)
r = repeat("y = é + 'œ'", setup = "é = 'œ' * %i" % size)
print('7:', r)
r = repeat("y = é + 'œ'", setup = "é = '€' * %i" % size)
print('8:', r)



>c:\python32\pythonw -u "vitesse3.py"    
1: [0.3603178435286996, 0.42901157137281515, 0.35459694357592086]
2: [0.3576409223543202, 0.4272010951864649, 0.3590055732104662]
3: [0.3552022735516487, 0.4256544908828328, 0.35824546465278573]
4: [0.35488168890607774, 0.4271707696118834, 0.36109528098614074]
5: [0.3560675370237849, 0.4261538782668417, 0.36138160167082134]
6: [0.3570182634788317, 0.4270155971913008, 0.35770629956705324]
7: [0.3556977225493485, 0.4264969117143753, 0.3645634239700426]
8: [0.35511247834379844, 0.4259628665308437, 0.3580737510097034]
>Exit code: 0
>c:\Python33\pythonw -u "vitesse3.py"
1: [0.3053600256152646, 0.3306491917840535, 0.3044963374976518]
2: [0.36252767208680514, 0.36937298133086727, 0.3685573415262271]
3: [0.7666293438924097, 0.7653473991487574, 0.7630926729867262]
4: [0.7636680712265038, 0.7647586103955284, 0.7631395397838059]
5: [0.44721085450773934, 0.3863234021671369, 0.45664368355696094]
6: [0.44699700013114807, 0.3873974001136613, 0.45167383387335036]
7: [0.4465200615491014, 0.387050034441188, 0.45459690419205856]
8: [0.44760587465455437, 0.3875261853459726, 0.45421212384964704]
>Exit code: 0


The difference between a correct (coherent) unicode handling and ...

jmf



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