Scientific Computing Using Python - PHYS:4905
    Python Homework #3
    Due 9/5/2019
    
    
    This assignment must be handed in electronically.  You will
    need to upload one file for each problem containing your Python code
    as a text file.  Please have the file name start with your last
    name, e.g. smith.py.  You can make the name longer if you like,
    e.g. smith_hw3_1.py for the first problem and smith_hw3_2.py for the
    second.  I will grade the assignment by downloading your code
    and running it, so you should be sure that it is complete and runs
    correctly under Spyder.
    
    
    1. (10) Write a Python program to play the simplified version of
    Craps discussed in class.  The program should keep rolling the
    dice until you win or lose.  The program should print out the
    values of the two die for all the rolls.  You will be graded on
    the quality of your comments as well as that of your code. 
    This will be true for all future programming assignments in this
    homework and all future assignments.
    
    
    2. (10) Write a Python script to ask the user for an integer,
    determine if it is a prime, and then inform the user.