Python 自带计时工具 timeit
jopen
12年前
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
</div> 实例：
import timeit def func1(x): pow(x, 2) def func2(x): return x * x v = 10000 func1_test = 'func1(' + str(v) + ')' func2_test = 'func2(' + str(v) + ')' print timeit.timeit(func1_test, 'from __main__ import func1') print timeit.timeit(func2_test, 'from __main__ import func2') print timeit.repeat(func1_test, 'from __main__ import func1') print timeit.repeat(func2_test, 'from __main__ import func2')
实例2：
#! /usr/bin/env python # -*- coding: u8 -*- import random import timeit def randDiff( k,n ): '产生k个不相等的从1到n的随机数' p = [] y1 = [random.randrange(1,n+1) for i in range(n)] y2 = [] y2.extend(y1) y1.sort() for j in range(k): temp1 = y1[j] temp2 = y2.index(temp1) p.append(temp2 + 1) y2[temp2] = -1 return p def randDif(k,n): '新函数,生成k个1到n之间不相等的随机数' if k>n: return [] a = range(1,n+1) random.shuffle(a) return a[:k] if __name__=='__main__': print timeit.repeat("randDiff(3, 10)", "from __main__ import randDiff", timeit.default_timer, 3, 10000) print timeit.repeat("randDif(3, 10)", "from __main__ import randDif", timeit.default_timer, 3, 10000)