Web Reference: 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: 1 day ago · The isinstance() built-in function is recommended for testing the type of an object, because it takes subclasses into account. With three arguments, return a new type object. 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.
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