StopIteration
StopIteration is the Python exception raised when an iterator or generator has no further values to produce.
Python Workout: 50 ten-minute exercises
StopIteration is the Python exception raised by an exhausted iterator to signal that no further values are available.
- How it is used
- Signals iterator exhaustion so for loops and other consumers can terminate cleanly.
- How deep it goes
- Defines the protocol, traces custom implementation, contrasts helper iterators, and explains generator completion behavior.
- Examples
- Uses a traced LoudIterator, a helper iterator for repeated loops, generator functions, and a repeating Circle iterator.
- What you can do after
- Build it from scratch by implementing finite, reusable, or repeating Python iterators.
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Python Workout, Second Edition
StopIteration is the Python exception raised by an exhausted iterator to signal that no more values are available.
- How it is used
- Explains how Python for loops detect exhausted iterators and how custom iterators signal completion.
- How deep it goes
- Explains __iter__, __next__, stored iteration state, custom classes, and generator termination, but does not pursue advanced iterator designs fully.
- Examples
- Uses strings, lists, dictionaries, files, a traced LoudIterator, generator functions, and a chained generator.
- What you can do after
- Build iterable classes that return values from __next__ and terminate correctly with StopIteration.
Read how Python Workout, Second Edition explains StopIteration →
Related concepts
- iteratorpart of · An iterator is an object or abstraction that provides successive values from a sequence or data source through a traversal protocol.
- __next__produced by · __next__ is a Python special method that returns an iterator’s next item or raises StopIteration when no items remain.
- exceptionkind of · An exception is a runtime signal or object representing an abnormal condition that interrupts ordinary program flow and may be handled or propagated.
- loopaddresses · A loop is a programming control-flow construct that repeatedly executes a block of instructions according to an iteration rule or continuation condition.
- generatorused by · A generator is a language construct or computation that produces values incrementally on demand, typically suspending and resuming while preserving its state.
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