【python】字符串翻转

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python中常见的字符串反转的方法

s = "abcdef"
#1. 切片操作
def string_reverse1(string):
    print(string[::-1])
s1 = string_reverse1(s)

#2. 使用列表的reverse函数
def string_reverse2(string):
    li = list(string)
    li.reverse()
    print(''.join(li))
s2 = string_reverse2(s)

#3. 采用递归的方式
def string_reverse3(string):
    if string == "":
        return s1
    else:
        return string_reverse3(string[1:])+string[0]
s3 = string_reverse(s)
print(s3)

#4. reduce函数
from functools import reduce
def string_reverse4(s):
    return reduce(lambda x, y:y+x, s)
s4 = string_reverse(s)
print(s4)

#5. 空字符串翻转
def string_reverse5(string):
    s = ''.join(reversed(string))
    print(s)
s5 = string_reverse5(s)

#6. 交换位置
def string_reverse6(string):
    t = list(string)
    l = len(t)
    for i, j in zip(range(l-1, 0, -1), range(l//2)):
        t[i], t[j] = t[j], t[i]
    return "".join(t)
s6 = string_reverse6(s)
print(s6)

#7. for循环
def string_reverse7(string):
    return ''.join(string[i] for i in range(len(string)-1, -1, -1))

def string_reverse7(string):
    a = ""
    for i in range(len(string)-1, -1, -1):
        a += string[i]
    return a
s7 = string_reverse7(s)
print(s7)