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Comprehensions & generators

List/dict/set comprehensions, generator expressions, and lazy iteration.

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Comprehensions & generators easy

How to Close a Generator and Handle GeneratorExit in Python

This Python code demonstrates how to explicitly close a generator using the close() method and handle the GeneratorExit exception through a finally block to run cleanup logic.

generators generator-exit close
Python 
def countdown(n):
    try:
        while n > 0:
            yield n
            n -= 1
    finally:
        print(f"Generator closed after countdown completed")


if __name__ == "__main__":
    gen = countdown(5)
    print(next(gen))
    print(next(gen))
    gen.close()
    print("Generator closed explicitly")
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