next()
IterableRetrieves the next item from an iterator. Raises StopIteration if exhausted (unless default given).
Signature
next(iterator, default)
Returns
anyExample
it = iter([10, 20, 30]) print(next(it)) # 10 print(next(it)) # 20 print(next(it, 'done')) # 30
About next()
next is a Python iterable function with the signature next(iterator, default). Retrieves the next item from an iterator. Raises StopIteration if exhausted (unless default given). It returns a value of type any.
Python provides a rich set of built-in functions and standard library modules that cover common programming tasks. Understanding these functions helps you write more idiomatic, efficient Python code. The nextfunction is commonly used in data processing, web development, scripting, and automation tasks.
When working with next(), consider edge cases like empty inputs, None values, and type mismatches. Python's duck typing means many built-in functions work with any object that implements the required protocol (e.g., __len__ for len(), __iter__ for iteration). This flexibility is a key strength of Python's design philosophy.