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    ACCESSING LIST ITEMS
                     We use an index number to access the list items just like strings. Use the index operator [ ] to
                     access the elements of a list.

                     Program 15: To access the different elements of a list.
                          Program15.py

                       File  Edit    Format    Run    Options    Window      Help
                       List1=[1,2,3,11,12,13,'Computer',40, 'Science']                     Output
                       print (List1[2])
                                                                                         3
                       print (List1[6])
                                                                                         Computer
                       print (List1[-2]))                                                40

                     LIST FUNCTIONS
                     Let us study some of the functions we can use with lists.

                     The append() Function
                     The append() function inserts the object passed to it at the end of the list. Syntax of using append()
                     function is:

                         list_name.append(item)
                     Program 16: To add an element to a list using append() function.

                         Program16.py

                      File  Edit  Format   Run   Options   Window     Help

                      a=[1,2,3,4,5]
                      a.append(6)                                                  Output
                      print (a)                                                 [1, 2, 3, 4, 5, 6]

                     The extend( ) Function
                     Using the append( ) function, we can only add one element at a time. For adding more than one
                     element, we use the extend( ) function. Syntax of using extend() function is:

                         list_name.extend(iterable value)
                     Program 17: To add elements to an existing list using extend() function.

                         Program17.py
                      File  Edit  Format   Run    Options   Window    Help

                      a=[1,2,3,4,5]
                      a.extend([6,7,8,9])
                      print (a)

                                                                                       Functions, String and List in Python  91

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