Python - Instance Variables

Instance variables are variables whose values can change from object to object.

Each object gets its own copy of instance variables.

• Inside the constructor using self
• Inside an instance method using self
• Outside the class using the object reference

Here, eno, ename, and esal are instance variables initialized inside the constructor.

100 Durga 10000

Instance variables are accessed using self inside the class and using the object reference outside the class.

Inside class: Sunny
Outside class: Sunny

We can delete instance variables using del self.variableName inside the class or del object.variableName outside the class.

After deletion, accessing the variable raises an AttributeError.

10
AttributeError: 'Test' object has no attribute 'a'

Topic	Meaning
Instance variable	Variable tied to a specific object
self	Used to access object data
del	Deletes instance variables