python中的列表操作效率

# coding:utf-8
from timeit import Timer


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


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


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


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


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


if __name__ == '__main__':
    timer1 = Timer("test1()", "from __main__ import test1")
    print("append:", timer1.timeit(1000))

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

    timer3 = Timer("test3()", "from __main__ import test3")
    print("[i for i in range(10000)]:", timer3.timeit(1000))

    timer4 = Timer("test4()", "from __main__ import test4")
    print("list(range(10000)):", timer4.timeit(1000))
    timer5 = Timer("test5()", "from __main__ import test5")
    print("extend:", timer5.timeit(1000))