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Jorge Godoy schrieb:
> Dan Pascu <[EMAIL PROTECTED]> writes:
>
>> That is a common myth. People should test things themselves instead
>> of believing everything that is written on the net.
>
> There were recent optimizations on that area IIRC. I believe that the
> statement is true with Python 2.X where X < 4.
I just did some quick tests: As of Python 2.4 string-concat using '+'
seams to be faster than the '%' operator. Sorry, no Python 2.3 at hand
to check it against.
- --------------
s = "foo"
s += "bar"
>> 0.400207996368
- --------------
s = "foo"
s = s + "bar"
>> 0.398325920105
- --------------
s = "foo"
s = ''.join((s, "bar"))
>> 0.929105997086
- --------------
s = "foo"
s = "%sbar" % s
>> 0.675987958908
- --------------
s = "foo"
s += "bar"
s += "baz"
>> 0.716789007187
- --------------
s = "foo" + "bar" + "baz"
>> 0.655229091644
- --------------
s = ''.join(("foo", "bar", 'baz'))
>> 0.883416175842
- --------------
s = '%s%s%s' % ("foo", "bar", 'baz')
>> 0.902904987335
- --------------
s = "foo"
s = "%sbar" % s
>> 0.682669878006
Code:
cases = [ '''
s = "foo"
s += "bar"
''', '''
s = "foo"
s = s + "bar"
''', '''
s = "foo"
s = ''.join((s, "bar"))
''', '''
s = "foo"
s = "%sbar" % s
''', '''
s = "foo"
s += "bar"
s += "baz"
''', '''
s = "foo" + "bar" + "baz"
''', '''
s = ''.join(("foo", "bar", 'baz'))
''', '''
s = '%s%s%s' % ("foo", "bar", 'baz')
''', '''
s = "foo"
s = "%sbar" % s
''' ]
from timeit import Timer
for c in cases:
t = Timer(stmt=c)
print '--------------',
print c,
print '>>', t.timeit()
- --
Sch?nen Gru? - Regards
Hartmut Goebel
| Hartmut Goebel | IT-Security -- effizient |
| [EMAIL PROTECTED] | www.goebel-consult.de |
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