Which method can you use to determine whether an object is an instance of a class?

Question

BlackTom AI · Accepted Answer

To determine whether an object is an instance of a class, we need to assess each provided option in turn and explain why it does or does not serve that purpose.
Option 1: isinstance
This is the correct approach in Python. The isinstance(object, classinfo) function returns True if the object is an instance of the class or of a subclass thereof, and False otherwise. It directly addresses the concept of instance membership within a class hierarchy.
Option 2: isobject
This option is not a standard Python built-in function or operator for type or instance checking. It does not exist in the Python language, so it cannot be used to determine instance relationships. Relying on it would be a misconception about available tools.
Option 3: isclass
This name suggests a function that might check whether something is a class object itself, rather than an instance. However, there is no built-in isclass function in Python’s standard library for this purpose. Even if a similar concept existed in some frameworks, the phrasing here would not reliably determine instance status.
Option 4: issubclass
This function tests whether a class is a subclass of another class, not whether a given object is an instance. issubclass(A, B) returns True if A derives from B, but it does not tell you anything about a specific object’s instantiation. Therefore, it answers a different question than the one asked.

CMPSC 132 Spring 2025 Module 3.2 Checkpoint

Which method can you use to determine whether an object is an instance of a class?

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