`csv`

Comma-separated values reader and writer. Supports custom dialects, quoting policies, and dictionary-shaped rows.

Source-of-record: Lib/csv.py, Modules/_csv.c, csv docs.

Functions and classes

Name	Purpose
`reader(csvfile, dialect='excel', **fmtparams)`	Row iterator of `list[str]`.
`writer(csvfile, dialect='excel', **fmtparams)`	Row writer; `writerow`, `writerows`.
`DictReader(f, fieldnames=None, restkey=None, restval=None, dialect='excel', **kw)`	Dict rows.
`DictWriter(f, fieldnames, restval='', extrasaction='raise', dialect='excel', **kw)`	Dict rows.
`Sniffer()`	`sniff`, `has_header`.
`list_dialects()` / `get_dialect(name)`	Registered dialects.
`register_dialect(name, dialect=None, **fmtparams)`	Register.
`unregister_dialect(name)`	Remove.
`field_size_limit([new_limit])`	Max field length.

Parameter	Default	Meaning
`delimiter`	`,`	Field separator.
`quotechar`	`"`	Quote character.
`doublequote`	True	Escape quote by doubling.
`escapechar`	None	Alternative escape.
`lineterminator`	`\r\n`	Writer row terminator.
`quoting`	`QUOTE_MINIMAL`	Quoting policy.
`skipinitialspace`	False	Ignore space after delimiter.
`strict`	False	Raise on bad input.

QUOTE_ALL, QUOTE_MINIMAL, QUOTE_NONNUMERIC, QUOTE_NONE, QUOTE_STRINGS (3.12+), QUOTE_NOTNULL (3.12+).

excel, excel-tab, unix.

Area	State
`reader`, `writer`	Complete.
`DictReader`, `DictWriter`	Complete.
`Sniffer`	Complete.
All quoting modes incl. 3.12+ additions	Complete.