Purposes of this assignment

• To give you more experience with basic Python
• To familiarize you with:
  • Simple input
  • Random numbers
  • Writing and using functions

General idea of the assignment

"Pig" is a very simple game. Two players take turns; on each turn, a player rolls a six-sided die ("die" is the singular of "dice") as many times as she wishes, or until she rolls a 1. Each number she rolls, except a 1, is added to her score this turn; but if she rolls a 1, her score for this turn is zero, and her turn ends. At the end of each turn, the score for that turn is added to the player's total score. The first player to reach or exceed 100 wins.

For example:

• Alice rolls 3, 5, 3, 6, and stops. Her score is now 19.
• Bob rolls 5, 4, 6, 6, 2, and stops. His score is now 23.
• Alice rolls 5, 3, 3, 5, 4, and stops. Her score is now 39 (19 + 20).
• Bob rolls 4, 6, 1. He has to stop, and his score is still 23 (23 + 0).
• Etc.

As defined above, the first player has an advantage. To make the game more fair, we will say that if the first player reaches or exceeds 100, the second player gets one additional turn. (If the second player is the first to reach 100, the first player does not get an additional turn.)

Your assignment is to implement the game of Pig. You will play against the computer. The computer always goes first, so you get one more turn if the computer is the first to reach 100.

If both players are tied with 100 or more, each gets another turn until the tie is broken.

Specific functions

• def main():
• This is where your program will start execution.
• def instructions():
• Tell the user the rules of the game.
• def human_move(computer_score, human_score):
• Tells the user both her current score and the computer's score, and how far behind (or ahead) she is. Then repeatedly asks whether the user wants to roll again. This continues until either:
• The user decides not to roll again. The function should return the total of the rolls made during this move.
• The user rolls a 1. The function should return 0.

• def computer_move(computer_score, human_score):
• The computer rolls some number of times, displays the result of each roll, and the function returns the result (either 0 or the total of the rolls). The function may use its parameters in order to play more intelligently (for example, it may wish to gamble more agressively if it is behind).
• def is_game_over(computer_score, human_score):
• Returns True if either player has 100 or more, and the players are not tied, otherwise it returns False. (Call this  only after the human's move.)
• def roll():
• Returns a random number in the range 1 to 6, inclusive. To do this, find the random module on https://docs.python.org/3/library/index.html and follow the link to find the randint method.
• def ask_yes_or_no(prompt):
• Prints the prompt as a question to the user, for example, "Roll again? ". If the user responds with a string whose first character is 'y' or 'Y', the function returns True. If the user responds with a string whose first character is 'n' or 'N', the function returns False. Any other response will cause the question to be repeated until the user provides an acceptable response.
• def show_results(computer_score, human_score):
• Tells whether the human won or lost, and by how much. (Call this when the game has ended.)

Due date

Submit your pig.py file to Canvas by 11:59pm Tuesday, September 13. Since this will be a single file, there is no need to zip it.

Only files submitted to Canvas will be accepted. I do not accept assignments submitted by email.