"Play“没有定义- Pylance (reportUndefinedVariable)

Question

我刚刚开始学习Python，在调用类时遇到了困难。我在使用代码。我查过错误，但找不到任何有用的东西。到目前为止，我所有的经验都是关于Java的，并且认为我可能搞混了一些东西。任何帮助都将不胜感激！

print("Lets play a game!")

dotheywantotplay = input("Do you want to play Rock-Paper-Scissors? (y or n) ")

if dotheywantotplay == "y":

    player1 = input('Enter first players name: ')
    player2 = input('Enter second players name: ')

    personchoice1 = input("What move will you do? [\"Rock\", \"Paper\", \"Scissors\"]")

    personchoice2 = input("What move will you do? [\"Rock\", \"Paper\", \"Scissors\"]")

    Play(personchoice1,personchoice2) // The error looks like its this line

else:
    print("I am so sad now :-(")
    exit()


class Play:
    def __init__(player1, player2):

        if player1 == player2:
                print("Tie!")
        elif player1 == "Rock":
            if player2 == "Paper":
                print("You lose!", player2, "covers", player1)
            else:
                print("You win!", player1, "smashes", player2)
        elif player1 == "Paper":
            if player2 == "Scissors":
                print("You lose!", player2, "cut", player1)
            else:
                print("You win!", player1, "covers", player2)
        elif player1 == "Scissors":
            if player2 == "Rock":
                print("You lose...", player2, "smashes", player1)
            else:
                print("You win!", player1, "cut", player2)
        else:
            print("That's not a valid play. Check your spelling!")

以上是供今后参考的原始问题。以下是解决办法。Python与Java不同，因为在引用类之前，必须先定义它们。这意味着类必须位于python文件的顶部。希望这能帮助其他Java书呆子尝试用Python编写程序..。

​

    print("Lets play a game!")
    
    dotheywantotplay = input("Do you want to play Rock-Paper-Scissors? (y or n) ")
    




print("Lets play a game!")

dotheywantotplay = input("Do you want to play Rock-Paper-Scissors? (y or n) ")



class Play:
    def __init__(self, player1, player2, name1, name2 ):

        self.player1 = player1
        self.player2 = player2
        self.name1 = name1
        self.name2 = name2


        if player1 == player2:
                print("Tie!")
        elif player1 == "Rock":
            if player2 == "Paper":
                print("You Win ", name2,"!")
                print(player2, "covers", player1)
            else:
                print("You Win ", name1,"!")
                print(player1, "smashes", player2)
        elif player1 == "Paper":
            if player2 == "Scissors":
                print("You Win ", name2,"!")
                print(player2, "cut", player1)
            else:
                print("You Win ", name1,"!")
                print(player1, "covers", player2)
        elif player1 == "Scissors":
            if player2 == "Rock":
                print("You Win ", name2,"!")
                print(player2, "smashes", player1)
            else:
                print("You Win ", name1,"!")
                print(player1, "cut", player2)
        else:
            print("That's not a valid play. Check your spelling!")


if dotheywantotplay == "y":

    player1 = input('Enter first players name: ')
    player2 = input('Enter second players name: ')

    personchoice1 = input("What move will you do? \"Rock\", \"Paper\", \"Scissors\"  ")
    personchoice2 = input("What move will you do? \"Rock\", \"Paper\", \"Scissors\"  ")

    Play(personchoice1,personchoice2, player1, player2)

else:
    print("I am sad now :-(")
    exit()

Answer 1

Python是从上到下执行的，因此您的所有类和finctions都应该在调用之前定义(所以放在顶部)。也是

class Play:
    def __init__(player1, player2):
        self.player1 = player1
        self.player2 = player2

您应该像这样在类中定义属性，在此之前，self引用类的当前实例，这里中的所有内容。