Which built-in function can be used to check if an object is an instance of a class or a subclass thereof? type()isinstance()issubclass()id()

To check if an object is an instance of a class or a subclass thereof in Python, you would use the isinstance() function. Here’s a brief overview of the options provided:

1. type(): This function returns the type of an object, but it does not check for inheritance.
2. isinstance(): This is the correct function to use. It checks if an object is an instance of a class or a subclass thereof.
3. issubclass(): This function checks if a class is a subclass of another class, but it does not check instances.
4. id(): This function returns the identity of an object, which is not related to type checking.

Final Answer

The built-in function you should use is isinstance().