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In-Depth Python OOP
In-Depth Python OOP
4. Polymorphism and Abstraction
Useful Functions
isinstance()
The isinstance() (is instance) is a Python built-in function that checks object is an instance of a certain class and return the bool value (True or False). This function takes 2 arguments: instance and class:
print(isinstance(662, int)) print(isinstance(25.3, int))
You can use this function to check your instances:
class User: pass user = User() print(isinstance(user, User))
issubclass()
The issubclass() (is subclass) is a Python built-in function that checks class is a Child of another class:
class First: pass class Second(First): pass class Third(Second): pass print(issubclass(Second, First)) print(issubclass(Third, First))
The issubclass() function works with classes only. If you want to check the instance, use the type() function inside the issubclass():
class A: pass class B(A): pass instance = B() print(issubclass(type(instance), A))
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