next() — Advanced Examples

Retrieves the next item from an iterator

next() protocol implementation

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

python

# next() - implementing the protocol
class Custom:
    def __next__(self):
        return "custom result"

obj = Custom()
print(next(obj))

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

Handling unusual inputs and edge cases.

python

# next() edge cases
print("Edge case handling for next()")

# Type checking
print(type(42))

Knowing these edge cases prevents subtle bugs in production.

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