Web Reference: Jul 11, 2025 · isinstance () is a built-in Python function that checks whether an object or variable is an instance of a specified type or class (or a tuple of classes), returning True if it matches and False otherwise, making it useful for type-checking and ensuring safe operations in dynamic code. Jan 28, 2013 · If you are interested in checking if an instance is an object of any class whether user defined or concrete you can simply check if it is an instance of object which is ultimate base class in python. The built-in isinstance() function checks if an object is an instance of a specified class or a subclass thereof, returning a Boolean value. It’s a versatile tool for explicit type checking in Python, as it considers subclass relationships:
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