csv

CSV file reading and writing.

import csv

Functions

csv.reader(lines: list[str]) -> CsvReader

Create a CSV reader from a list of lines.

csv.writer(output: TextWriter) -> CsvWriter

Create a CSV writer that writes to a TextWriter.

csv.dict_reader(lines: list[str], fieldnames: list[str] | None = None) -> CsvDictReader

Create a CSV DictReader from a list of lines.

csv.dict_writer(output: TextWriter, fieldnames: list[str]) -> CsvDictWriter

Create a CSV DictWriter that writes to a TextWriter.

CsvReader

Reads CSV data from a list of lines, parsing each line into a list of fields.

Properties

Name	Type	Description
line_num	int

CsvWriter

Writes CSV data to a TextWriter.

writerow(row: list[str])

Write a single row of fields to the CSV output.

writerows(rows: list[list[str]])

Write multiple rows of fields to the CSV output.

CsvDictReader

Reads CSV data and maps each row to a dictionary keyed by field names.

Properties

Name	Type	Description
fieldnames	list[str] \| None

CsvDictWriter

Writes CSV data from dictionaries keyed by field names.

Properties

Name	Type	Description
fieldnames	list[str]

writeheader()

Write the field names as a header row.

writerow(row: dict[str, str])

Write a single row from a dictionary in field name order.

writerows(rows: list[dict[str, str]])

Write multiple rows from dictionaries.