Python Classwork: Number Stats, Part 2
    Copy your "NumberStatsPart1.py" program into a new file named
    "NumberStatsPart2.py".  Then, in addition to displaying the sum and
    mean of the numbers, you will also need to display both the range
    and the median of the list of integers.  This means that you will
    need to store the numbers in a list, and then numerically sort the
    numbers after the user has finished entering them.

    The range of a list of numbers is the difference between the
    largest number and smallest number in the list.  The median is the
    middle number when the list is arranged in numerical order.  If
    the list contains an even number of integers, then the median is
    the average of the two middle numbers when the list is in order.

    As was the case with part #1, your program does not need to
    perform any error trapping.  That is, you may once again assume
    that the user will enter only integers.

    Your program's output should be formatted in a manner similar to
    what is shown below.  You may put all of your code into the main
    area of the program.  Your program should not import or use any
    external functions.


    Example Program Run #1
    ----------------------
    Please enter an integer:

    You did not enter any numbers.  Goodbye!


    Example Program Run #2
    ----------------------
    Please enter an integer:  3
    Please enter an integer:  4
    Please enter an integer:  5
    Please enter an integer:  6
    Please enter an integer:  5
    Please enter an integer:  6
    Please enter an integer:  7
    Please enter an integer:

    The sum of your numbers is:  36
    The average of your numbers is:  5.14
    The range of your numbers is:  4
    The median of your numbers is:  5


    Example Program Run #3
    ----------------------
    Please enter an integer:  17
    Please enter an integer:  -3
    Please enter an integer:

    The sum of your numbers is:  14
    The average of your numbers is:  7
    The range of your numbers is:  20
    The median of your numbers is:  7


    Example Program Run #4
    ----------------------
    Please enter an integer:  5
    Please enter an integer:  0
    Please enter an integer:  13
    Please enter an integer:  4
    Please enter an integer:

    The sum of your numbers is:  22
    The average of your numbers is:  5.5
    The range of your numbers is:  13
    The median of your numbers is:  4.5


    Example Program Run #5
    ----------------------
    Please enter an integer:  12
    Please enter an integer:  3
    Please enter an integer:  11
    Please enter an integer:  3
    Please enter an integer:  18
    Please enter an integer:

    The sum of your numbers is:  47
    The average of your numbers is:  9.4
    The range of your numbers is:  15
    The median of your numbers is:  11