Panduan Kejuruteraan: Freelance Python Programmer: Streaming 1M+ Row Excel (XLSX) & CSV Exports. Aldian Fazrihady ialah Programmer Bebas Kanan & Jurutera AI (Python, Django, FastAPI, React, Next.js, TypeScript, Golang).

Export million-row financial ledgers to `.xlsx` and `.csv` in constant <50MB RAM without worker OOM crashes by hiring senior freelance Python programmer Aldian Fazrihady.

from django.http import StreamingHttpResponse
import csv

class EchoBuffer:
    def write(self, value: str) -> str:
        return value

def stream_million_row_csv(queryset_iterator):
    pseudo_buffer = EchoBuffer()
    writer = csv.writer(pseudo_buffer)
    return StreamingHttpResponse(
        (writer.writerow([row.id, row.amount_cents, row.created_at.isoformat()]) for row in queryset_iterator),
        content_type="text/csv",
        headers={"Content-Disposition": 'attachment; filename="ledger_export.csv"'},
    )

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