dictionary blog surya

 

 PYTHON PROGRAMMING - DICTIONARY


 

DICTIONARY:

         1 . Dictionary is an unordered sequence of data of key-value pair form.

       2. Dictionaries are written within curly braces in the form key:value.

       3. It is very useful to retrieve data in an optimized way among a large amount of data.

EXAMPLE:

         a = {'name':'Meera', 'gender':'Female', 'dept':'EEE' }
         print(a['name'])


DICTIONARY METHODS:

       1.CLEAR( ):  

                  The clear( ) method removes all items from the dictionary. This method doesn't return any value. The clear( )
method doesn't take any parameters.

          SYNTAX:  dict.clear( ) 

EXAMPLE:

2. COPY( ):

                             The copy( ) method returns a shallow copy of the dictionary. The copy( ) method doesn't take any parameters. This method returns a shallow copy of the dictionary. It doesn't modify the original dictionary.

             SYNTAX: dict.copy( )  


                 EXAMPLE:  

 

3. FROMKEYS( ):

                            The fromkeys( ) method creates a new dictionary from the given sequence of elements with a value provided by the user. This method takes two parameters sequence and value(optional).

                SYNTAX:  dict.fromkeys(sequence[, value])

EXAMPLE:


    

 4. GET( ):

                                  The get( ) method returns the value for the specified key if key is in dictionary. This method takes maximum of two parameters key and value(optional). 

                   SYNTAX: dict.get(key[, value])

         EXAMPLE:   

5. ITEMS 

            The items( ) method returns a view object that displays a list of dictionary's (key,value) tuple pairs. This method doesn't take any parameters.

               SYNTAX: dictionary.items( )

        EXAMPLE:



            


           
6. KEYS( ):

                          The keys( ) method returns a view object that displays a list of all the keys in the dictionary. When the dictionary is changed, the view object also reflects these changes. This method doesn't take any parameters.  

                      

                  SYNTAX: dict.keys( )

                    
                    EXAMPLE:

 7. POP( ):

                      The pop method( ) removes and returns an element from a dictionary having the given key. This method takes two parameters key and default.

                   SYNTAX: dictionary.pop(key[, default])

            EXAMPLE:   


              8. POPITEM( ):

                               The python popitem( ) method removes and returns the last element (key, value) pair inserted into the dictionary. This method doesn't take any parameters.

                      SYNTAX: dict.popitem( )

        EXAMPLE:

9.SETDEFAULT()

                                  The setdefault( ) method returns the value of a key (if the key is in dictionary). If not, it inserts key with a value to the dictionary.

                         SYNTAX: dict.setdefault(key[, default_value])


            EXAMPLES:

10. UPDATE( ):

                                 The update( ) method updates the dictionary with the elements from the another dictionary object or from an iterable of key/value pairs. This method adds element(s) to the dictionary if the key is not in the dictionary, it updates the key with the new value

         1. The update( ) method takes either a dictionary or an iterable object of key/value pairs(generally tuples).

         2. If  update( ) method is called without passing parameters, the dictionary remains unchanged.

                            SYNTAX : dict.update([othe

  EXAMPLE:    


11.VALUES()

                The values( ) method returns a view object that displays a list of all the values in the dictionary. This method doesn't take any parameters.

         SYNTAX: dictionary.values( )

        EXAMPLE: 

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