[英]how to measure execution time of functions (automatically) in Python
我需要有一个基类 ,我将用它来继承其他类,我想测量其函数的执行时间。
因此, 这一翻译有像这样的 :
class Worker():
def doSomething(self):
start = time.time()
... do something
elapsed = (time.time() - start)
print "doSomething() took ", elapsed, " time to finish"
#outputs: doSomething() took XX time to finish
我想要这样的东西:
class Worker(BaseClass):
def doSomething(self):
... do something
#outputs the same: doSomething() took XX time to finish
所以BaseClass需要处理测量时间
一种方法是使用装饰器(装饰器的PEP) (关于装饰器的一系列教程文章中的第一篇) 。 这是一个做你想要的例子。
from functools import wraps
from time import time
def timed(f):
@wraps(f)
def wrapper(*args, **kwds):
start = time()
result = f(*args, **kwds)
elapsed = time() - start
print "%s took %d time to finish" % (f.__name__, elapsed)
return result
return wrapper
这是其使用的一个例子
@timed
def somefunction(countto):
for i in xrange(countto):
pass
return "Done"
为了说明它是如何工作的,我从python提示符调用了该函数:
>>> timedec.somefunction(10000000)
somefunction took 0 time to finish
'Done'
>>> timedec.somefunction(100000000)
somefunction took 2 time to finish
'Done'
>>> timedec.somefunction(1000000000)
somefunction took 22 time to finish
'Done'
还有timeit ,它是标准库的一部分,并且非常易于使用。 记住:不要重新发明轮子!
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