字符串逆转的七种方式

Posted 2021-01-30 chenliang0309

1.列表的方式

def func_01(s):
    a = list(s)
    a.reverse()
    a = "".join(a)
    return a


b = func_01("hello")
print(b)

2.切片的方式

def func_02(s):
    s = s[::-1]
    return s


c = func_02("world")
print(c)

3.reduce

from functools import reduce


def func_03(s):
    s = reduce(lambda x, y: y + x, s)
    return s


d = func_03("haha")
print(d)

4.类似切片的方式

def func_04(s):
    str_01 = ""
    length = len(s) - 1
    while length >= 0:
        str_01 += s[length]
        length -= 1
    return str_01


e = func_04("hello world")
print(e)

5.使用递归

def func_05(s):
    if len(s) < 1:
        return s
    return func_05(s[1:]) + s[0]


e = func_05("123")
print(e)

6.使用栈

def func_06(s):
    list_01 = list(s)  # 模拟全部入栈
    result = ""
    while len(list_01) > 0:
        result += list_01.pop()  # 模拟出栈
    return result


f = func_06("456")
print(f)

7.for循环

def func_07(s):
    result = ""
    max_index = len(s) - 1
    for index_01, value in enumerate(s):
        result += s[max_index - index_01]
    return result


g = func_07("789")
print(g)