timeit 性能测试

1. timeit模块

可以用来测试一小段Python代码的执行速度。

计时器类：class timeit.Timer(stmt='pass', setup='pass', timer=<timer function>)

Timer是测量小段代码执行速度的类

　　stmt：是要测试的代码语句（statment），也可以传方法名

　　setup：运行语句时，需要的设置，例如为了执行time.time()要引入time包

　　timer：是一个定时器函数，与平台有关，不需要处理

函数：timeit.Timer.timeit(number=1000000)

　　Timer类中测试语句执行速度的对象方法

　　number参数是测试代码时的测试次数，默认为1000000次

　　方法返回执行代码的平均耗时，一个float类型的秒数

 

# -*- coding:utf-8 -*-
def test1():
    l = []
    for i in range(3000):
        l.append(i)

def test2():
    l = []
    for i in range(3000):
        l.insert(0, i)

def test3():
    l = [i for i in range(3000)]

def test4():
    l = list(range(3000))

def test5():
    l = []
    for i in range(3000):
        l.extend([i])

def test6():
    l = []
    for i in range(3000):
        l = l + [i]

def test7():
    l = []
    for i in range(3000):
        l += [i]

from timeit import Timer

print('开始测试')
t1 = Timer("test1()", "from __main__ import test1")
print("append:			", t1.timeit(number=1000), "秒")
t2 = Timer("test2()", "from __main__ import test2")
print("insert:		", t2.timeit(number=1000), "秒")
t3 = Timer("test3()", "from __main__ import test3")
print("推倒：		", t3.timeit(number=1000), "秒")
t4 = Timer("test4()", "from __main__ import test4")
print("list:		", t4.timeit(number=1000), "秒")
t5 = Timer("test5()", "from __main__ import test5")
print("extend:		", t5.timeit(number=1000), "秒")
t6 = Timer("test6()", "from __main__ import test6")
print("+:		", t6.timeit(number=1000), "秒")
t7 = Timer("test7()", "from __main__ import test7")
print("+=:		", t7.timeit(number=1000), "秒")
print('结束测试')