'''

timeit库Timer函数

'''

from timeit import Timer

def test1():

    l = list(range(1000))

def test2():

    l = []

    for i in range(1000):

        l.append(i)

def test3():

    l = []

    for i in range(1000):

        l = l + [i]

def test4():

    l = [i for i in range(1000)]

if __name__ == '__main__':

    # Timer函数，函数名，导入包

    t1 = Timer("test1()","from __main__ import test1")

    # timeit运行次数

    print(t1.timeit(number = 1000))

    t2 = Timer("test2()","from __main__ import test2")

    print(t2.timeit(number =1000))

    t3 = Timer("test3","from __main__ import test3")

    print(t3.timeit(number=1000))

    t4 = Timer("test4","from __main__ import test4")

    print(t4.timeit(number=1000))