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How to Stream Large CSV Files in Python

Process a large CSV file in memory-efficient chunks using Python's csv module, yielding batches of rows instead of loading everything at once.

csv streaming memory-efficient
Python 
import csv
from pathlib import Path

def process_csv_in_chunks(file_path, chunk_size=1000):
    """Yield rows from a large CSV file in chunks without loading all into memory."""
    with open(file_path, 'r', newline='') as f:
        reader = csv.DictReader(f)
        chunk = []
        for row in reader:
            …
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