isinstance() — Advanced Examples

Returns True if an object is an instance of a given class or tuple of classes

EasyIntermediateAdvancedExpert

isinstance() protocol implementation

Implementing the protocol that isinstance() uses under the hood.

python
# isinstance() - implementing the protocol
class Custom:
    def __isinstance__(self):
        return "custom result"

obj = Custom()
print(isinstance(obj))

Understanding the dunder methods that isinstance() calls helps you customize behavior for your own classes.

Edge cases with isinstance()

Handling unusual inputs and edge cases.

python
# isinstance() edge cases
print("Edge case handling for isinstance()")

# Type checking
print(type(42))

Knowing these edge cases prevents subtle bugs in production.

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