Python 自带计时工具 timeit

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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:
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')
Python 自带计时工具 timeit


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)
Python 自带计时工具 timeit
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