Question

I am on Windows 11 home, Python 3.12.2. I am playing with the rock, paper scissors application. I would like to check if the user input is a valid choice. I experimented with try / except and if / in. I would like to restart the loop if the user enters a value other than the valid entries. I ve commented out the current attempt. Otherwise the program works OK. Suggestions?

import random
valid_values = ["rock", "paper", "scissors", "quit"]

victories = [
    ["paper", "rock"],
    ["rock", "scissors"],
    ["scissors", "paper"]
    ]

# create while loop until user exits
while True:
    # prompt user to challenge computer to a game
    user_input = input("Choose rock, paper, scissors, or quit ")
    challenge = user_input.lower()
    # check if user_input is valid
    # if challenge in valid_values:
    #    continue
    # else:
    #    print("this is not a valid value")
    if challenge == "quit":
        print("OK, bye")
        break
    else:
        # generate random rock, paper, scissors
        guess = random.choice(valid_values[0:2])
        # determine winner and display result
        if challenge == guess:
            print("Tie!")
        elif [challenge, guess] in victories:
            print(f"The {challenge} beats the {guess}, you win!")
        else:
            print(f"The {guess} beats the {challenge}, you lose!")type here

如果该条目无效,我想重新开始。我要么既得不错,又得起/损失,要么可以放弃。或许是因为继续

Answer 1

你们评论的守则是紧密的,但逻辑恰恰相反,因为它应当<条码>。只有当投入为而不是时,才允许使用。 a 有效价值:

if challenge not in valid_values:
    print("this is not a valid value")
    continue

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