Python 3：为什么我的类的函数运行两次？

Question

我有一个包含这种攻击功能类：

def attack(self, victim): 
    strike = 0 
    if victim.strength > self.strength: 
     strike = 40 
    else: 
     strike = 70 
    successChance = randint(1,100) 
    if successChance > strike: 
     self.lives -= 1 
     return False 
    else: 
     victim.lives -= 1 
     return True 

它只应该给每个用户按下按钮时运行一次，但它运行两次也就是说每按下按钮计为两个。我知道错误发生在我的类函数中，因为错误发生在类的测试运行期间。

调用函数的类中唯一的代码是我的测试函数，它只能在内部运行。然而问题仍然存在于我的GUI代码中。

这是我的类函数：

class Player(object): 

def __init__(self, name="", lives=DEFAULT_LIVES): 
    self._name = name 
    self.lives = lives 
    self.strength = randint(1,10) 
    if self._name== "Test": 
     self.lives = 1000 
    if self._name== "": 
     self._name = "John Smith" 
def __str__(self): 
    return (self._name + " Life: " + str(self.lives) + " Strength: " + str(self.strength)) 

def getLives(self): 
    return self.lives 

def getStrength(self): 
    self.strength = randint(1,10) 
    return self.strength 

def getName(self): 
    return self._name 

def isAlive(self): 
    if self.lives <= 0: 
     return False 
    return True 

def attack(self, victim): 
    if victim.strength > self.strength: 
     strike = 40 
    else: 
     strike = 70 
    successChance = randint(1,100) 
    if successChance > strike: 
     print(successChance) 
     self.lives -= 1 
     return False 
    else: 
     print(successChance) 
     victim.lives -= 1 
     return True 


def test(): 
    player = Player("Tyler") 
    opponent = Player(choice(opponentList)) 
    while player.isAlive() == True and opponent.isAlive() == True: 
     print(player) 
     print(opponent) 
     player.attack(opponent) 
     player.isAlive() 
     opponent.isAlive() 
     if not player.attack(opponent): 
      print("You lost") 
     else: 
      print("You won") 
    print("Game Over") 

if __name__ == '__main__': 
    test() 

Answer 1

那么，如果看起来像你实际上是在测试（）调用该函数两次：

#your old code: 
while player.isAlive() == True and opponent.isAlive() == True: 
    print(player) 
    print(opponent) 
    player.attack(opponent) #called once here 
    player.isAlive() 
    opponent.isAlive() 
    if not player.attack(opponent):#called 2nd time here 
     print("You lost") 
    else: 
     print("You won") 
print("Game Over") 

我想尝试这个：

while player.isAlive() and opponent.isAlive(): 
    print(player) 
    print(opponent) 
    player_attack_was_successful = player.attack(opponent) 
    #player.isAlive() #(does this line even do anything?) 
    #opponent.isAlive() 
    if player_attack_was_successful: 
     print("You won") 
    else: 
     print("You lost") 
print("Game Over")