python 定时执行指定的函数
发布时间:2020-12-17 17:08:27 所属栏目:Python 来源:网络整理
导读:今天PHP站长网 52php.cn把收集自互联网的代码分享给大家,仅供参考。 python 定时执行指定的函数 # time a function using time.time() and the a @ function decorator# tested with Python24 vegaseat 21aug2005 import
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python 定时执行指定的函数
# 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 using a sieve algorithm getPrimeList took 4750.000 ms """ 以上内容由PHP站长网【52php.cn】收集整理供大家参考研究 如果以上内容对您有帮助,欢迎收藏、点赞、推荐、分享。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |