码厩技术博客Python 自带计时工具 timeit
Timer 类：
__init__(stmt="pass", setup="pass", timer=default_timer)
stmt 是执行语句，setup 是导入执行语句环境
print_exc(file=None)
timeit(number=default_number)
返回测试所用秒数，number 是每个测试中调用被计时语句的次数
repeat(repeat=default_repeat, number=default_number)
返回测试所用秒数列表，repeat 是重复整个测试的次数，number 是每个测试中执行语句的次数
快捷方法：
timeit(stmt="pass", setup="pass", timer=default_timer, number=default_number)
= Timer(stmt, setup, timer).timeit(number)
repeat(stmt="pass", setup="pass", timer=default_timer, repeat=default_repeat, number=default_number)
= Timer(stmt, setup, timer).repeat(repeat, number)
default_timer 在 win32 下是 time.clock()，在 linux 下是 time.time()
default_number = 1000000
default_repeat = 3
实例：
1import timeit 2 3def func1(x): 4 pow(x, 2) 5 6def func2(x): 7 return x * x 8 9v = 10000 10 11func1_test = 'func1(' + str(v) + ')' 12func2_test = 'func2(' + str(v) + ')' 13 14print timeit.timeit(func1_test, 'from __main__ import func1') 15print timeit.timeit(func2_test, 'from __main__ import func2') 16 17print timeit.repeat(func1_test, 'from __main__ import func1') 18print timeit.repeat(func2_test, 'from __main__ import func2')
实例2：
1#! /usr/bin/env python 2# -*- coding: u8 -*- 3import random 4import timeit 5 6def randDiff( k,n ): 7 '产生k个不相等的从1到n的随机数' 8 p = [] 9 y1 = [random.randrange(1,n+1) for i in range(n)] 10 y2 = [] 11 y2.extend(y1) 12 y1.sort() 13 for j in range(k): 14 temp1 = y1[j] 15 temp2 = y2.index(temp1) 16 p.append(temp2 + 1) 17 y2[temp2] = -1 18 return p 19 20def randDif(k,n): 21 '新函数,生成k个1到n之间不相等的随机数' 22 if k>n: 23 return [] 24 a = range(1,n+1) 25 random.shuffle(a) 26 return a[:k] 27 28# 关于上面两个函数：http://www.oschina.net/question/153568_23095?sort=time 29 30if __name__=='__main__': 31 print timeit.repeat("randDiff(3, 10)", "from __main__ import randDiff", timeit.default_timer, 3, 10000) 32 print timeit.repeat("randDif(3, 10)", "from __main__ import randDif", timeit.default_timer, 3, 10000)
