What is Python Class Variable Vs Instance Variable?
In Python, class variables and instance variables are two types of attributes used in classes. Class variables are shared across all instances of a class; they are defined within the class but outside any instance methods. This means that if one instance modifies a class variable, the change is reflected across all instances. In contrast, instance variables are unique to each instance; they are defined within instance methods (usually the `__init__` method) and can have different values for different instances. Thus, class variables maintain a single state for all instances, while instance variables allow for individual object states.