Reference library

Comprehensions & generators

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

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Comprehensions & generators easy

Batch Rows in Chunks with a Generator in Python

Group a list of row dicts into fixed-size chunks using a generator that yields one slice per call.

generators chunking database
Python 
from typing import Iterator, List


def batch_rows(rows: List[dict], batch_size: int) -> Iterator[List[dict]]:
    for i in range(0, len(rows), batch_size):
        yield rows[i:i + batch_size]


if __name__ == "__main__":
    sample_rows = [
        {"id": 1, "name": "Alice"},
        {"id": 2, "name": "Bob"},
      …
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Comprehensions & generators — Python code examples

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