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Comprehensions & generators

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

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Comprehensions & generators medium

Merge Sorted Iterators with a Heap Generator in Python

Merge multiple sorted iterators into a single sorted stream using a heap and generator, yielding values lazily in order.

heapq generator merge
Python 
import heapq

def merge_sorted_iterators(*iterators):
    heap = []
    for idx, iterator in enumerate(iterators):
        try:
            value = next(iterator)
            heapq.heappush(heap, (value, idx, iterator))
        except StopIteration:
            continue

    while heap:
        value, idx, iterator = …
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