def check_palindrome(my_str):
   mid_val = (len(my_str)-1)//2
   start = 0
   end = len(my_str)-1
   flag = 0
   while(start<mid_val):
   if (my_str[start]== my_str[end]):
      start += 1
      end -= 1
   else:
      flag = 1
      break;
   if flag == 0:
      print("所输入的字符串为回文")
   else:
      print("所输入的字符串不是回文")
def check_symmetry(my_str):
   n = len(my_str)
   flag = 0
   if n%2:
      mid_val = n//2 +1
   else:
      mid_val = n//2
   start_1 = 0
   start_2 = mid_val
   while(start_1 < mid_val and start_2 < n):
      if (my_str[start_1]== my_str[start_2]):
         start_1 = start_1 + 1
         start_2 = start_2 + 1
      else:
         flag = 1
         break
   if flag == 0:
      print("所输入的字符串为对称")
   else:
      print("所输入的字符串不是对称")
my_string = 'phphhphp'
print("正在调用检查回文的方法...")
check_palindrome(my_string)
print("正在调用检查对称的方法...")
check_symmetry(my_string)

正在调用检查回文的方法...
所输入的字符串为回文
正在调用检查对称的方法...
所输入的字符串不是对称