#!usr/bin/env python 
# encoding:utf-8 
def strReverse(strDemo):
 return strDemo[::-1] 
print(strReverse('pythontab.com'))

#!usr/bin/env python 
# encoding:utf-8 
def strReverse(strDemo): 
 strList=[] 
 for i in range(len(strDemo)-1, -1, -1): 
  strList.append(strDemo[i])
 return ''.join(strList)
print(strReverse('pythontab.com'))

#!usr/bin/env python 
# encoding:utf-8 
def strReverse(strDemo): 
 strList = list(strDemo) 
 strList.reverse() 
 return ''.join(strList)
print(strReverse('pythontab.com'))

#!usr/bin/env python 
# encoding:utf-8 
import collections 
def strReverse(strDemo): 
 deque1=collections.deque(strDemo) 
 deque2=collections.deque() 
 for tmpChar in deque1: 
  deque2.extendleft(tmpChar) 
 return ''.join(deque2) 
print(strReverse('pythontab.com'))

#!usr/bin/env python 
# encoding:utf-8 
def strReverse(strDemo): 
 if len(strDemo)<=1: 
  return strDemo 
 return strDemo[-1]+strReverse(strDemo[:-1]) 
print(strReverse('pythontab.com'))

#!usr/bin/env python 
#encoding:utf-8 
 
def strReverse(strDemo): 
 strList=list(strDemo) 
 if len(strList)==0 or len(strList)==1: 
  return strList 
 i=0 
 length=len(strList) 
 while i < length/2: 
  strList[i], strList[length-i-1]=strList[length-i-1], strList[i] 
  i+=1
 return ''.join(strList)
print(strReverse('pythontab.com'))