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That's because StopIteration is the normal, expected signal to tell whomever is iterating that there is nothing more to be produced. A generator function is a special kind of iterator; it indeed raises StopIteration when the function is done (i.e. when it returns, so yes, return None raises StopIteration).
Feb 5, 2024 · However, starting from Python 3.3, the StopIteration exception has been replaced with StopIteration becoming a part of the BaseException class, and the StopIteration exception itself is no longer explicitly raised. Instead, the built-in function next() returns StopIteration to signal the end of the iterator. Why StopIteration Occurs in Python ...
Jun 24, 2023 · Why does StopIteration occur? Understanding the iterator protocol and the role of the __next__() method. Section 2: Examples of StopIteration Errors. Iterating over a list using an iterator and ...
It’s important to note that Python treats raising StopIteration as an exception rather than a mistake. Like how Python handles other exceptions, this exception can be handled by catching it. This active handling of the StopIteration exception allows for proper control and management of the iteration process, ensuring that the code can gracefully handle the termination of the iteration when ...
To fix the error, catch the StopIteration exception and handle it appropriately. In a loop, use a for loop instead of a while loop to automatically handle the StopIteration exception. Alternatively, use a try-except block to catch the StopIteration exception and gracefully exit the loop or function.
You can read up on the relevant PEPs 234 255 if you want to know more behind why StopIteration was introduced and the logic behind iterators. A general principle in python is to have one way to do something (see import this), and preferably its beautiful
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The StopIteration exception is raised when the __next__() method of an iterator object is called but there are no items to iterate over. This exception is used to signal the end of iteration. The builtin next () function is used to retrieve the next item from an iterator object. It actually calls the __next__() method of the iterator object.
