翻轉字符串

將字符串翻轉
# 1.倒序切片法
 a = 'qwertyuiop'
 a = a[::-1]
 print(a)

# 2.使用列表翻轉在拼接
 a = 'qwertyuiop'
 a = list(a)
 a.reverse()
 a = ''.join(a)
 print(a)

# 3.循環反向迭代法
 a = 'qwertyuiop'
 b = ''
 for i in a:
     b = i+b
 print(b)

# 4.遍歷索引法
 a = 'qwertyuiop'
 b = ''
 for i in range(1,len(a)+1):
     b = b + a[-i]
 print(b)

# 5.列表彈出法
 a = 'qwertyuiop'
 a = list(a)
 b = ''
 while len(a)>0:
     b += a.pop()
 print(b)