csv — CSV Parsing and Writing¶

The csv module provides RFC 4180 compliant CSV parsing and writing.

Import¶

import csv

API Reference¶

Function	Description
`csv.parse(data: str) -> list[list[str]]`	Parse CSV string into rows
`csv.parse_delim(data: str, delim: str) -> list[list[str]]`	Parse with custom delimiter
`csv.format(rows: list[list[str]]) -> str`	Format rows into CSV string
`csv.read_file(path: str) -> list[list[str]]`	Read CSV file into rows
`csv.write_file(path: str, rows: list[list[str]]) -> int`	Write rows to CSV file (0=ok)

Examples¶

Parse a CSV string¶

import csv

let data = "name,age,city\nAlice,30,NYC\nBob,25,LA"
let rows = csv.parse(data)

let header = rows[0]
print(header[0])  # name
print(header[1])  # age

let row = rows[1]
print(row[0])     # Alice
print(row[1])     # 30

Write CSV to file¶

import csv

let rows = [["name", "score"], ["Alice", "95"], ["Bob", "87"]]
csv.write_file("/tmp/scores.csv", rows)

Custom delimiter (TSV)¶

import csv

let tsv_data = "name\tage\nAlice\t30"
let rows = csv.parse_delim(tsv_data, "\t")

Features¶

RFC 4180 compliant — handles quoted fields, escaped quotes (""), commas and newlines inside quoted fields
Read/write files directly with read_file and write_file
Custom delimiters for TSV and other variants