>>> strA = "abcdegfgijlk"
>>> strA[::-1]
'kljigfgedcba'

#coding=utf-8
strA = raw_input("请输入需要翻转的字符串：")
order = []
for i in strA:
 order.append(i)
order.reverse()  #将列表反转
print ''.join(order)  #将list转换成字符串

请输入需要翻转的字符串：abcdeggsdd
ddsggedcba

>>> str_a = "1a2b3c4d5e6f"
***输出奇数位的字符***
>>> for i in str_a[::2]:
...  print i,
...
1 2 3 4 5 6
***输出偶数位的字符***
>>> for j in str_a[1::2]:
...  print j,
...
a b c d e f

#coding=utf-8
def oddEven(strA):
 odd = []
 even = []
 for i in range(len(strA)):
  if i % 2 == 0:
   even.append(strA[i])
  else :
   odd.append(strA[i])
 print "偶数项：", ''.join(even)
 print "奇数项：", ''.join(odd)
strA = "1a2b3c4d5e6f7g8h9j"
print "原字符串：", strA
oddEven(strA)

原字符串： 1a2b3c4d5e6f7g8h9j
偶数项： 123456789
奇数项： abcdefghj

>>> a = '123'
>>> isinstance(a, str)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: isinstance() arg 2 must be a class, type, or tuple of classes and types