AttributeError：'str'对象没有属性'attack'“'Help！”

Question

I have q quick question regarding an Attribute Error regarding a basic Arena battler I am writing for my Intro to Programming Class. Here is the chunk of code that I am having trouble with upon running the program,

class Enemy:
    def __init__(self,player,weapons,armor):

        self.name = "Bad Guy" 
        self.health = 100
        self.attackPower = (player.attack + randint(-5,5))
        self.defensePower = (player.defense + randint(-5,5))
        self.weapon = player.weapon
        self.armor = player.armor
    def name_generator(self):
        import random
        element = ["Thunder","Lightning","Wind","Fire", "Stone"]
        tool = ["Hammer","Drill","Cutter","Knife", "Saw"]
        randomNumber1 = random.randrange(0,len(element))
        randomNumber2 = random.randrange(0,len(tool))
        self.randomname = element[randomNumber1] + " " + tool[randomNumber2]
        return self.randomname

Lol, ignore the Name Generator for now, thats an idea Ill try to work out later. The Current problem I am having now is that when I run the program through IDLE i get the following error;

  File "C:\Users\Caleb Walter\Downloads\Arena_Battler.py", line 150, in __init__
    self.attackPower = int(player.attack + randint(-5,5))
AttributeError: 'str' object has no attribute 'attack'

Any Help would be appreciated on the program error, as I have done research and tried to find the answer but all of the other casses of 'str' error involved lists. Thank You in Advance!

Answer 1

显然，您正在使用播放器名称（字符串）而不是播放器对象（带有参数“攻击”，“防御”等）来调用此类的构造函数（在其中实例化）。

Answer 2

How to read and understand error messages, so that you can help yourself:

First, we read it:

File "C:\Users\Caleb Walter\Downloads\Arena_Battler.py", line 150, in __init__
self.attackPower = int(player.attack + randint(-5,5))
AttributeError: 'str' object has no attribute 'attack'

The first line says what file and line we were at when the problem occurred. The second line is a copy of the line causing the problem, so we can look at it without having to go back and look it up. The last line is a description of what the actual problem was.

Therefore, the next step is to read what the problem was. AttributeError means that we tried to get an attribute from something that doesn't have it. The rest says what kind of thing we tried to get it from (a 'str' object , ie, a string), and what we tried to get (an attribute named attack ).

Next we look at the line in question. Where do we attempt to get an attribute named attack from something? Clearly, it's the part where we've written player.attack . Thus, we now know what happened: our code tries to get the attack attribute from the player variable, but player is referring to a string, and strings don't have an attack attribute. (Obviously; what is the attack of "hi mom" ? That doesn't make any sense.)

How did this happen? Well, if we wrote code that tries to read an attack attribute, clearly we must have been expecting it to be there. We don't expect such an attribute on strings, so the error is that we've put a string into player when we expected something else.

How does the value get into player ? It's a parameter to the function. Therefore, we called it wrongly, and we go off to find the line of code where we called it (hint: look at the previous entry in the stack-trace ), and fix the surrounding code. What were we supposed to pass? Well, something that does have an attack , obviously. Did you have some kind of Player class? Then you should be passing an instance of that, rather than a (the player's?) name or whatever.