python定时执行指定函数的方法

# 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
"""