python 定时执行指定的函数，python指定函数,python定时执行指定

python定时执行指定的函数```python

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_timingdef 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) # n0.5 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 = (mm-3)//2 s[j] = 0 while j < half: s[j] = 0 j += m i = i+1 m = 2i+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 algorithmgetPrimeList took 4750.000 ms"""```