Generators and yield

Generators and yield is a reusable Python snippet. Generators produce values lazily using `yield`, making them memory-efficient for large sequences. The full implementation: # Generator function def fibonacci(limit): a, b = 0, 1 for _ in range(limit): yield a a, b = b, a + b for num in fibonacci(10): print(num) # 0, 1, 1, 2, 3, 5, 8, 13, 21, 34 # Generator expression (like list comprehension but lazy) squares = (x**2 for x in range(1000000)) # No memory issue - produces values on demand # yield from (delegate to sub-generator) def chain(*iterables): for it in iterables: yield from it list(chain([1,2], [3,4]))… It belongs to the Built-in Functions area of the standard library. This snippet uses only the Python standard library with no third-party dependencies, so it runs on any modern Python 3 interpreter. Browse more patterns in the snippet library, or paste the code straight into the playground to experiment with it.