timeit 基本用法

# coding:utf-8

from timeit import Timer

# 代码执行时间测量:
# timeit模块 : 用来测试python代码的执行时间

def test1():
    li = []
    for i in range(0, 10000):
        li.append(i)

def test2():
    li = []
    for i in range(0, 10000):
        li += [i]

def test3():
    li = [i for i in range(0, 10000)]

def test4():
    li = list(range(0, 10000))

def test5():
    li = []
    for i in range(0, 10000):
        li.extend([i])


# 第一个参数: 需要执行的函数 , 第二个参数: 函数需要导入的包
timer1 = Timer("test1()", "from __main__ import test1")
print("timer1+:", timer1.timeit(1000))

timer2 = Timer("test2()", "from __main__ import test2")
print("timer2+:", timer1.timeit(1000))

timer3 = Timer("test3()", "from __main__ import test3")
print("timer3+:", timer3.timeit(1000))

timer4 = Timer("test4()", "from __main__ import test4")
print("timer4+:", timer4.timeit(1000))