CODEWITHSUNDEEP
pythonpython-3.xclass
Not A E-Surfer
Not A E-Surfer

Reputation: 1

I'm getting an error that a class has no members which has been defined

I've been learning Python for one week now and I've been trying to create a text based game. Everything so far is good, I've been able to write lots of useful code but I just get this same problem and I don't know why.

Whenever it's time to define the name and the color of the character (its a frog). I thought that using a class would be the most appropiate thing, the problem is that when I try to call the member to change its content I get the next problem: Class Frog has no 'name' member, it also happens with color

The problem is that I defined it in the class which contains the player atributes.

Here is the piece of code that is giving me problems.

class Frog:
    def __init__(self, name, color):
        self.name = str
        self.color = str

def changeAtributes():
    print("change name")
    option = input("--> ")
    Frog.name == option
    print("\nchange color")
    option = input("-->")
    Frog.color == option

changeAtributes()

Upvotes: -1

Views: 488

Answers (3)

Olivier Archer
Olivier Archer

Reputation: 71

Your changeAtributes function should be a method of the class Frog, not a regular function.

A method is like a normal function, but it's first argument is self.

class Frog:
    def __init__(self, name, color):
        self.name = name
        self.color = color

    def changeAtributes(self, name, color):
        self.name = name
        self.color = color

    def __str__(self):
        """return a string representing the class instance"""
        return f'name: {self.name}, color: {self.color}'


frog = Frog("jumpy", "red")
print(frog)
print("change name")
name = input("--> ")
print("\nchange color")
color = input("-->")
frog.changeAtributes(name, color)
print(frog)

$ python frog.py 
name: jumpy, color: red
change name
--> sleepy

change color
-->blue
name: sleepy, color: blue

Upvotes: 0

OldWizard007
OldWizard007

Reputation: 370

You didn't instantiate your class. You have to first assign the parameters of name and color in the dunder __init__ which is in the Frog Class. After that you will be able to modify the values in the changeAttributes function. And to change the values in the Frog Class using the function, you have to pass the instantiated class as an argument to teh function.

class Frog:
    def __init__(self, name, color):
        self.name = str
        self.color = str

def changeAtributes(frogObject): # Pass frogObject as an argument.
    print("change name")
    option = input("--> ")
    Frog.name == option
    print("\nchange color")
    option = input("-->")
    Frog.color == option

frogObject = Frog("Molly", "Green")
changeAtributes(frogObject)

Upvotes: 0

n1c9
n1c9

Reputation: 2687

You're trying to change attributes of the class itself, not instantiations of that class - i.e., you have to first define a frog with something like frog = Frog(name='nick', color='green' and then call your changeAttributes function like so:

def changeAtributes(frog):
    print("change name")
    option = input("--> ")
    frog.name = option
    print("\nchange color")
    option = input("-->")
    frog.color = option

frog = Frog(name='nick', color='green')
changeAtributes(frog)

Upvotes: 1

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