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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)






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