巨蟒岩，纸，剪刀游戏虫？

Question

我创建了我的第一个实用程序，但有些地方不对劲。如果我运行下面的代码，考虑到每一个可能的结果，我有时会得到错误的结果。例如，用户选择岩石，程序剪刀，结果是程序获胜，当它不应该。我是初学者，所以这可能是新手的错误。

starter = True
while starter:
  import random
  user_input = input("Choose Rock, Paper or Scissors: ")
  choice = ["Rock", "Paper", "Scissors"]
  choice_lower = ["rock", "paper", "scissors"]
  program_choice = random.choice(choice)

  while user_input not in choice or user_input in choice_lower:
    if user_input in choice or user_input in choice_lower:
        break
    else:
        user_input = input("Invalid input! Choose Rock, Paper or Scissors: ")
        continue

  if user_input == program_choice or user_input == program_choice.lower():
    print(f"You chose: {user_input}")
    print(f"It's a draw! The computer chose {program_choice} too!")
  elif user_input == "Rock" or user_input == "rock" and program_choice == "Paper":
    print(f"You chose: {user_input}\nThe program chose: {program_choice}\nThe program won!")
  elif user_input == "Paper" or user_input == "paper" and program_choice == "Rock":
    print(f"You chose: {user_input}\nThe program chose: {program_choice}\nYou won!")
  elif user_input == "Scissors" or user_input == "scissors" and program_choice == "Paper":
    print(f"You chose: {user_input}\nThe program chose: {program_choice}\nYou won!")
  elif user_input == "Rock" or user_input == "rock" and program_choice == "Scissors":
    print(f"You chose: {user_input}\nThe program chose: {program_choice}\nYou won!")
  elif user_input == "Paper" or user_input == "paper" and program_choice == "Scissors":
    print(f"You chose: {user_input}\nThe program chose: {program_choice}\nThe program won!")
  elif user_input == "Scissors" or user_input == "scissors" and program_choice == "Rock":
    print(f"You chose: {user_input}\nThe program chose: {program_choice}\nThe program won!")

  keep_going = input("Do you wanna play again? (Yes/No): ")
  answers = ["Yes", "yes", "No", "no"]
  while keep_going not in answers:
    keep_going = input("Invalid input! Do you wanna play again? (Yes/No): ")
    continue
  if keep_going == "Yes" or keep_going == "yes":
    continue
  else:
    starter = False

Answer 1

与在单独的if/elif案例中检查每一种情况不同，系统地检查事物更容易(且不容易出错)。例如，考虑以下版本的(一轮)“岩石剪刀”计划作为替代方案。

import random

choice =["rock", "paper", "scissors"]
lose = [(choice[i],choice[(i+1)%3]) for i in range(3)]
# equivalent: lose = [("rock","paper"),("paper","scissors"),("scissors","rock")]

program_choice = random.choice(choice)
# print(program_choice) # useful if you want to cheat

while True:
    user_input = input("Choose Rock, Paper or Scissors: ").lower()
    if user_input in choice:
        break
    else:
        print("Invalid Input!")

print(f"You chose: {user_input}\nThe program chose: {program_choice}")
if user_input==program_choice:
    print("It\'s a draw!")
elif (user_input,program_choice) in lose:
    print("The program won!")
else:
    print("You won!")