Add Python CSV export helper - #869
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Fixes #580.
Adds
sqlite_utils.export.rows_to_csv_file()for streaming the rows from a DB-API cursor to a CSV-compatible text stream from Python code.The helper:
cursor.descriptionby defaultdialect=lineterminator=Targeted tests cover CSV output, quoted values, headerless output, TSV output, and the error case where a cursor has no result columns.
Validation performed: a focused Python verification of the exact helper behavior and expected outputs passed. The full repository suite was not run because the execution environment could not resolve github.com for a checkout.
📚 Documentation preview 📚: https://sqlite-utils--869.org.readthedocs.build/en/869/