Python - dictionary

1.Difinition

  
    

   
     
   
     DictTest 
   
     =
   
      {
   
     "
   
     Key1
   
     "
   
     :
   
     "
   
     Value1
   
     "
   
     ,
   
     "
   
     Key2
   
     "
   
     :
   
     "
   
     Value2
   
     "
   
     ,
   
     "
   
     Key3
   
     "
   
     :
   
     "
   
     Value3
   
     "
   
     }
  
    

Note:  1)it is included by"{}"  2)it is one to one relationship  3)format:"key":"value"  4)Divied by comma
  5)key: Case senstive
 
2.Usage1)single
>>DictTest["key"]Value
2)>>print DictTest.items()---------Transfer to List

  
    

   
     
   
     >>
   
     print
   
      DictTest.items()
[(
   
     '
   
     Key1
   
     '
   
     ,
   
     '
   
     Value1
   
     '
   
     ),(
   
     '
   
     Key2
   
     '
   
     ,
   
     '
   
     Value2
   
     '
   
     ),(
   
     '
   
     Key3
   
     '
   
     ,
   
     '
   
     Value3
   
     '
   
     )]
  
    

Like:

  
    

   
     
   
     "
   
     %s=%s
   
     "
   
      
   
     %
   
      (k, v) 
   
     for
   
      k, v 
   
     in
   
      DictTest.items()
  
    

 
3.Update
>>DictTest["key"]=NewVaule
 
4.Delete
>>del DictTest["Key"]