python定时执行指定函数的方法_编程语言综合--HTML5中文学习网

　　本文实例讲述了python定时执行指定函数的方法。分享给大家供大家参考。具体实现方法如下：

# time a function using time.time() and the a @ function decorator

# tested with Python24 vegaseat 21aug2005

import time

def print_timing(func):

def wrapper(*arg):

t1 = time.time()

res = func(*arg)

t2 = time.time()

print '%s took %0.3f ms' % (func.func_name, (t2-t1)*1000.0)

return res

return wrapper

# declare the @ decorator just before the function, invokes print_timing()

@print_timing

def getPrimeList(n):

""" returns a list of prime numbers from 2 to < n using a sieve algorithm"""

if n < 2: return []

if n == 2: return [2]

# do only odd numbers starting at 3

s = range(3, n+1, 2)

# n**0.5 may be slightly faster than math.sqrt(n)

mroot = n ** 0.5

half = len(s)

i = 0

m = 3

while m <= mroot:

if s[i]:

j = (m*m-3)//2

s[j] = 0

while j < half:

s[j] = 0

j += m

i = i+1

m = 2*i+3

return [2]+[x for x in s if x]

if __name__ == "__main__":

print "prime numbers from 2 to <10,000,000 using a sieve algorithm"

primeList = getPrimeList(10000000)

time.sleep(2.5)

"""

my output -->

prime numbers from 2 to <10,000,000 using a sieve algorithm

getPrimeList took 4750.000 ms

"""

　　希望本文所述对大家的Python程序设计有所帮助。