4种生成N个整数列表的方法性能比较

代码呈现：

from timeit import Timer


def one():
    """循环连接列表"""
    l = []
    for i in range(1000):
        l = l + [i]


def two():
    """append添加"""
    l = []
    for i in range(1000):
        l.append(i)


def three():
    """列表推导式"""
    l = [i for i in range(1000)]


def four():
    """range函数转换"""
    l = list(range(1000))


T1 = Timer("one()", "from __main__ import one")
print("one: %f sec
" % T1.timeit(number=1000))

T2 = Timer("two()", "from __main__ import two")
print("two: %f sec
" % T2.timeit(number=1000))

T3 = Timer("three()", "from __main__ import three")
print("three: %f sec
" % T3.timeit(number=1000))

T4 = Timer("four()", "from __main__ import four")
print("four: %f sec
" % T4.timeit(number=1000))

结果：

one: 1.095957 sec

two: 0.057843 sec

three: 0.027013 sec

four: 0.011470 sec