本文實(shí)例講述了python定時(shí)執(zhí)行指定函數(shù)的方法。分享給大家供大家參考。具體實(shí)現(xiàn)方法如下：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
# time a function using time.time() and the a @ function decorator# tested with Python24 vegaseat 21aug2005import timedef 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) # 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 algorithmgetPrimeList took 4750.000 ms""" |
希望本文所述對(duì)大家的Python程序設(shè)計(jì)有所幫助。
