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Comprehensions & generators

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

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Comprehensions & generators easy

How to Delegate Iteration to a Subgenerator with yield from in Python

Use yield from to delegate iteration from one generator to a subgenerator, flattening nested generator output into a single sequence.

generators yield-from delegation
Python 
def subgenerator():
    yield "first"
    yield "second"
    yield "third"


def delegate():
    yield "before delegation"
    yield from subgenerator()
    yield "after delegation"


if __name__ == "__main__":
    for item in delegate():
        print(item)
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