ReadBigCsvFile

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ReadBigCsvFile

✓ Published0🌍 Public

Last edited Jan 20, 2025

Created on Dec 11, 2025

This example shows how to process and split a large CSV file into daily chunks by grouping rows based on a datetime column. It uses pandas’ `read_csv` with `chunksize` to load data incrementally, then applies `Grouper` with a daily frequency to partition each chunk. The multiprocessing variant uses `ProcessPoolExecutor` and a dedicated writer `Process` that receives grouped data via a `Queue` for concurrent file output. All writes use `to_csv` with append mode, preserving existing files and headers across runs.

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