python定时执行指定函数的方法

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。