The Ultimate Guide to Python Programming With Python 3.10 - @classmethod Decorator

The video tutorial explains how to use class methods in Python. It starts by introducing the concept of class methods and their purpose. The tutorial then demonstrates how to define a class method using the class method decorator. It explains the difference between using 'self' and 'cls' in methods and shows how to change class attributes using class methods. A practical example is provided to illustrate changing a class attribute, such as a currency symbol, across all instances of a class.

What is the primary difference between a class method and an instance method in Python?

• An instance method is always faster than a class method.

• A class method receives the class as the first argument.

• A class method can only be used with static variables.

• An instance method cannot modify class attributes.

Which decorator is used to define a class method in Python?

• @classmethod

• @staticmethod

• @property

• @decorator

When defining a class method, what is the conventional name for the first parameter?

• instance

• cls

• class

• self

What is the purpose of using a class method in the given example?

• To create a new instance of the class.

• To change the instance variable.

• To modify a class attribute.

• To delete an existing class attribute.

What common mistake is highlighted when running the code in the example?

• Running the code in the wrong file.

• Using 'self' instead of 'cls' in the method.

• Forgetting to import the class method decorator.

• Not defining the method as a static method.