import random
import time
import sys

yorn = True #Boolean for restarting game, loops until it reaches a 'False' and 'Break'


while yorn == True:

  fourno = [0,1, 2, 3, 4, 5, 6, 7, 8, 9 ] #List used for number combination generation (stores as integers)
  random.shuffle(fourno) #Shuffle list
  fourno2 = fourno[::3] #Picks out the first 4 numbers in the list
  print (fourno2) #Outputs number for test to show it works

  name = input("\nPlease enter your name: ")
  print ("Hello {0}!".format(name))

  #Bull + Cow counter

  bull = 0
  cow = 0
  while bull < 4: #Continue loop if the Bull counter is lower than 4
    bull = 0
    cow = 0

  #User input


    ui =  input("\nDo not enter duplicate numbers and only enter numbers in between 0-9.\n\nPlease type 'exit' if you would like to exit the game and reveal the numbers.\n\nPlease enter 4 digits: ").upper()
    if ui == "EXIT":
      print (fourno2)
      print ('\nExiting the script...\n')
      yorn == False
      break

  #Divides the numbers into individual lists for comparison & Validation "Try & Except"

    try:
      a = int(ui[0]) #Converted and then stored into integers
      b = int(ui[1])
      c =int(ui[2])
      d = int(ui[3])

    except ValueError:
      print ("{0}\n Invalid input... ".format(ui))
      continue

    print ("{0} {1} {2} {3}".format(a, b, c, d)) #Displays the numbers the user entered


  #Comparing the user input and the computer

  #Comparing Bulls with Bulls
  #Adds value to Bull if a number is placed in the same position as the generated list

    if a == fourno2[0]:
      bull = bull + 1

    if b == fourno2[1]:
      bull = bull + 1

    if c == fourno2[2]:
      bull = bull + 1

    if d == fourno2[3]:
      bull = bull + 1


  #Comparing Cows with Cows, 1st set
  #Adds value to Cow if there is a correct number but is not placed in the same position/is placed in the same position

    if a == fourno2[0]:
      cow = cow + 1

    if a == fourno2[1]:
      cow = cow + 1

    if a == fourno2[2]:
      cow = cow + 1

    if a == fourno2[3]:
      cow = cow + 1


  #Comparing Cows with Cows, 2nd set

    if b == fourno2[0]:
      cow = cow + 1

    if b == fourno2[1]:
      cow = cow + 1

    if b == fourno2[2]:
      cow = cow + 1

    if b == fourno2[3]:
      cow = cow + 1


  #Comparing Cows with Cows, 3rd set

    if c == fourno2[0]:
      cow = cow + 1

    if c == fourno2[1]:
     cow = cow + 1

    if c == fourno2[2]:
      cow = cow + 1

    if c == fourno2[3]:
      cow = cow + 1


  #Comparing Cows with Cows, 4th set

    if d == fourno2[0]:
      cow = cow + 1

    if d == fourno2[1]:
      cow = cow + 1

    if d == fourno2[2]:
      cow = cow + 1

    if d == fourno2[3]:
      cow = cow + 1


  #Displays results

    print ("Bull = {0}".format (bull))
    print ("Cow = {0} ".format (cow))


    #Play again?

  restart = input("Would you like to play again?\nYes or No? (Can type 'Y' or 'N'): ").upper() #Avoiding long line of code with differently written answers

  while not (restart == "Y" or restart == "N" or restart == "YES" or restart == "NO"): #Validating answer for restarting game
      print ("Not a valid answer\n")
      restart = input("Would you like to play again? ").upper()

  if restart == "Y"or restart == "YES":
    print ("\nRestarting\n--------------------------------------------------------------------\n")
    yorn = True
    continue

  elif restart == "N" or restart == "NO" :
    msg = ("\nThank you for playing!\nEnding program...\n..........\n..........\n..........\n\n\n\n")
    for i in msg:
      sys.stdout.write(i)
      sys.stdout.flush()
      time.sleep (0.05)
    yorn = False
  break

  if ui == "exit":
    print (fourno2)