Python Write a program that lets the user play the game of Rock, Paper, Scissors against the computer. The program should work as follows: When the program begins, a random number in the range of 1 through 3 is generated. If the number is 1, then the computer has chosen rock. If the number is 2, then the computer has chosen paper. If the number is 3, then the computer has chosen scissors. (Do not display the computer's choice yet) The user enters his or her choice of "rock", "paper, or "scissors" at the keyboard. The computer's choice is displayed. A winner is selected according to the following rules: If one player chooses rock and the other player chooses scissors, then rock wins. (Rock smashes scissors.) If one player chooses scissors and the other player chooses paper, then scissors wins. (Scissors cuts paper.) If one player chooses paper and the other play chooses rock, then paper wins (Paper wraps rock.) If both players make the same choice, the game must be played again to determine the winner.

Here is the Python program:

import random

#this method generates random number from 1 to 3 as computer choice #and if the randomNumber value is equal to 1 then computer chose rock, if #2 this means computer chose paper and otherwise scissors

def computerChoice():

   randomNumber = random.randint(1,3)

   if randomNumber == 1:

       return 'rock'

   elif randomNumber == 2:

       return 'paper'

   else:

       return 'scissors'

# this method checks if user entered his choice from the valid choices that #are rock, paper or scissors

def validChoice(choice):

   return choice == 'rock' or choice == 'paper' or choice == 'scissors'

#this method invoked when the user enters invalid choice and the loop in #this method keeps asking user to enter one of the rock paper or scissors #in order to play the game

def invalidChoice(choice):

   while choice != 'rock' and choice != 'paper' and choice != 'scissors':

       print('That is not a valid choice.')

       choice = input('\nEnter rock, paper, or scissors: ')

       return choice

#this method decides the winner from computer and user, if and elif #conditions check if the choice entered by the user is same as computer or #different and determines the winner accordingly

def winner(player, computer):

   if player == 'rock' and computer == 'scissors':

       print("rock smashes scissors")

       return True

   elif player == 'scissors' and computer == 'paper':

       print("scissors cuts paper")

       return True

   elif player == 'paper' and computer == 'rock':

       print("paper wraps rock")

       return True

   else:

       return False

#contains the computer choice

compChoice = computerChoice()

#contains choice that is input by user

playerChoice = input('Choose from rock, paper, or scissors: ')

#checks if user entered valid choice and calls invalidChoice if user entered #invalid choice which is not from rock paper or scissors

if not validChoice(playerChoice):

   playerChoice = invalidChoice(playerChoice)

#if the choices of user and computer are same then game is played again to #determine the winner

while playerChoice == compChoice:

   print('Computer\'s choice:', compChoice)

   print('Its a tie! Choose again.')

   compChoice = computerChoice()

   playerChoice = input('\nEnter rock, paper, or scissors: ')

   if not validChoice(playerChoice):

       playerChoice = invalidChoice(playerChoice)

#calls winner() method to determine the winner from user and computer

print('Computer\'s choice:', compChoice)

if winner(playerChoice, compChoice):

   print('Congratulations! You win!')

else:

   print('You lose! Computer wins!')

Explanation:

The program contains following methods:

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