Web Reference: Definition and Usage The isinstance() function returns True if the specified object is of the specified type, otherwise False. If the type parameter is a tuple, this function will return True if the object is one of the types in the tuple. 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. 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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