python之字符串反转

1.反向循环迭代

a ='abcdefg'
b = ''
for i in a:
    b = i+b
print(b)

2.反转列表

将字符串转换为列表，反转列表，将列表转换为字符串

a = 'abcdefg'
b = list(a)
b.reverse()
a = ''.join(b)
print(a)

3.反向循环迭代

a = 'abcdefg'
b = ''
for i in a[::-1]:
    b += i
print(b)

4.列表弹出发

a = 'abcdefg'
a = list(a)
b = ''
while len(a) > 0:
    b += a.pop()
print(b)