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    The syntax of for loop is as follows:
                      for <counter variable> in range(start, stop, step_size):
                          statements
                      The  range() function  is  an in-built  function  in Python.  This function  generates  a  sequence  of
                      numbers. A sequence is a succession of values bound together by a single name. The range()
                      function is generally used in the for loop to iterate over the sequence of numbers.
                      The general syntax for using the range() function is given below:
                         range(start, stop, step_size): The  start specifies the starting point for generating numbers.
                        By default, it starts from 0. The stop specifies the position up to which the numbers are to be
                        generated (last number is not included). The step_size specifies the increment or decrement. By
                        default, the value of the step_size = 1 and numbers are generated with an increment of 1. However,
                        we can generate numbers by specifying the value of step_size according to our requirement.
                         range(start, stop): It generates a set of whole numbers starting from ‘start’ to ‘stop–1’.
                        Example: range(3, 9) is equivalent to [3, 4, 5, 6, 7, 8].
                         range(stop): Generates a set of whole numbers starting from 0 to (stop–1).
                        Example: range(6) is equivalent to [0, 1, 2, 3, 4, 5].

                      The start and step_size values are optional in the application of range() function and they can
                      be omitted.
                      Pragram 6: To print odd numbers till 10 using start, stop and step values of a range function

                          Program6.py                                               Output
                       File  Edit  Format   Run   Options  Window    Help         1
                                                                                  3
                       for i in range (1,10,2):
                                                                                  5
                           print(i)
                                                                                  7
                                                                                  9

                      Program 7: To print a selected range of numbers with start and stop values.

                          Program7.py                                               Output
                       File  Edit  Format   Run   Options  Window    Help         3
                                                                                  4
                       for i in range (3,7):
                                                                                  5
                           print(i)
                                                                                  6

                      Program 8: To print whole numbers from 0 to 4 using only stop value

                          Program8.py                                               Output

                       File  Edit  Format   Run   Options  Window    Help         0
                                                                                  1
                       for i in range (5):
                                                                                  2
                           print(i)
                                                                                  3
                                                                                  4

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