Python类和对象属性错误：对象没有属性

Question

I am new to python and while learning OOP in python i am getting errors like

AttributeError: 'Dog' object has no attribute 'sound'

for below code

class Dog:
    def __init__(self, name, age):
        self.name  = name
        self.age  = age

    def description(self):
        return print(f"name is {self.name} and age is {self.age}")

    def speak(self, sound):
        return print(f"{self.name} says {self.sound}")

tommy = Dog("tommy",10)
tommy.description()
tommy.speak("bow-bow")

Now my other doubt is related to inheritance where i am getting error like:

AttributeError: 'Bulldog' object has no attribute 'speed'

for below code :

class Dog:
    def __init__(self, name, age):
        self.name  = name
        self.age  = age

    def description(self):
        return print(f"name is {self.name} and age is {self.age}")


class Bulldog(Dog):
    def run(self, speed):
        return print(f"The speed of dog is {self.speed}")

tommy = Bulldog("tommy",10)
tommy.description()
tommy.run(5)

Answer 1

I believe you need to remove the self. when trying to return the print as these are passed through as parameters and not identified in the object itself.

class Dog:
    def __init__(self, name, age):
        self.name  = name
        self.age  = age

    def description(self):
        return print("name is {self.age} and age is {self.age})


class Bulldog(Dog):
    def run(self, speed):
        return print(f"The speed of dog is {speed}")

tommy = Bulldog("tommy",10)
tommy.description()
tommy.run(5)

This is the same for both speed and sound, note I also changed some formatting about how the print statement works