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Update csv to 3.13.3 #5734

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80 changes: 71 additions & 9 deletions Lib/csv.py
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Original file line number Diff line number Diff line change
@@ -1,28 +1,90 @@

"""
csv.py - read/write/investigate CSV files
r"""
CSV parsing and writing.

This module provides classes that assist in the reading and writing
of Comma Separated Value (CSV) files, and implements the interface
described by PEP 305. Although many CSV files are simple to parse,
the format is not formally defined by a stable specification and
is subtle enough that parsing lines of a CSV file with something
like line.split(",") is bound to fail. The module supports three
basic APIs: reading, writing, and registration of dialects.


DIALECT REGISTRATION:

Readers and writers support a dialect argument, which is a convenient
handle on a group of settings. When the dialect argument is a string,
it identifies one of the dialects previously registered with the module.
If it is a class or instance, the attributes of the argument are used as
the settings for the reader or writer:

class excel:
delimiter = ','
quotechar = '"'
escapechar = None
doublequote = True
skipinitialspace = False
lineterminator = '\r\n'
quoting = QUOTE_MINIMAL

SETTINGS:

* quotechar - specifies a one-character string to use as the
quoting character. It defaults to '"'.
* delimiter - specifies a one-character string to use as the
field separator. It defaults to ','.
* skipinitialspace - specifies how to interpret spaces which
immediately follow a delimiter. It defaults to False, which
means that spaces immediately following a delimiter is part
of the following field.
* lineterminator - specifies the character sequence which should
terminate rows.
* quoting - controls when quotes should be generated by the writer.
It can take on any of the following module constants:

csv.QUOTE_MINIMAL means only when required, for example, when a
field contains either the quotechar or the delimiter
csv.QUOTE_ALL means that quotes are always placed around fields.
csv.QUOTE_NONNUMERIC means that quotes are always placed around
fields which do not parse as integers or floating-point
numbers.
csv.QUOTE_STRINGS means that quotes are always placed around
fields which are strings. Note that the Python value None
is not a string.
csv.QUOTE_NOTNULL means that quotes are only placed around fields
that are not the Python value None.
csv.QUOTE_NONE means that quotes are never placed around fields.
* escapechar - specifies a one-character string used to escape
the delimiter when quoting is set to QUOTE_NONE.
* doublequote - controls the handling of quotes inside fields. When
True, two consecutive quotes are interpreted as one during read,
and when writing, each quote character embedded in the data is
written as two quotes
"""

import re
import types
from _csv import Error, __version__, writer, reader, register_dialect, \
from _csv import Error, writer, reader, register_dialect, \
unregister_dialect, get_dialect, list_dialects, \
field_size_limit, \
QUOTE_MINIMAL, QUOTE_ALL, QUOTE_NONNUMERIC, QUOTE_NONE, \
QUOTE_STRINGS, QUOTE_NOTNULL, \
__doc__
QUOTE_STRINGS, QUOTE_NOTNULL
from _csv import Dialect as _Dialect

from io import StringIO

__all__ = ["QUOTE_MINIMAL", "QUOTE_ALL", "QUOTE_NONNUMERIC", "QUOTE_NONE",
"QUOTE_STRINGS", "QUOTE_NOTNULL",
"Error", "Dialect", "__doc__", "excel", "excel_tab",
"Error", "Dialect", "excel", "excel_tab",
"field_size_limit", "reader", "writer",
"register_dialect", "get_dialect", "list_dialects", "Sniffer",
"unregister_dialect", "__version__", "DictReader", "DictWriter",
"unregister_dialect", "DictReader", "DictWriter",
"unix_dialect"]

__version__ = "1.0"


class Dialect:
"""Describe a CSV dialect.

Expand Down Expand Up @@ -51,8 +113,8 @@ def _validate(self):
try:
_Dialect(self)
except TypeError as e:
# We do this for compatibility with py2.3
raise Error(str(e))
# Re-raise to get a traceback showing more user code.
raise Error(str(e)) from None

class excel(Dialect):
"""Describe the usual properties of Excel-generated CSV files."""
Expand Down
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