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test_csv.py
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# Copyright (C) 2001 Python Software Foundation
# csv package unit tests
import copy
import sys
import unittest
from io import StringIO
from tempfile import TemporaryFile
import csv
import gc
import pickle
from test import support
from test.support import import_helper, check_disallow_instantiation
from itertools import permutations
from textwrap import dedent
from collections import OrderedDict
class BadIterable:
def __iter__(self):
raise OSError
class Test_Csv(unittest.TestCase):
"""
Test the underlying C csv parser in ways that are not appropriate
from the high level interface. Further tests of this nature are done
in TestDialectRegistry.
"""
def _test_arg_valid(self, ctor, arg):
ctor(arg)
self.assertRaises(TypeError, ctor)
self.assertRaises(TypeError, ctor, None)
self.assertRaises(TypeError, ctor, arg, bad_attr=0)
self.assertRaises(TypeError, ctor, arg, delimiter='')
self.assertRaises(TypeError, ctor, arg, escapechar='')
self.assertRaises(TypeError, ctor, arg, quotechar='')
self.assertRaises(TypeError, ctor, arg, delimiter='^^')
self.assertRaises(TypeError, ctor, arg, escapechar='^^')
self.assertRaises(TypeError, ctor, arg, quotechar='^^')
self.assertRaises(csv.Error, ctor, arg, 'foo')
self.assertRaises(TypeError, ctor, arg, delimiter=None)
self.assertRaises(TypeError, ctor, arg, delimiter=1)
self.assertRaises(TypeError, ctor, arg, escapechar=1)
self.assertRaises(TypeError, ctor, arg, quotechar=1)
self.assertRaises(TypeError, ctor, arg, lineterminator=None)
self.assertRaises(TypeError, ctor, arg, lineterminator=1)
self.assertRaises(TypeError, ctor, arg, quoting=None)
self.assertRaises(TypeError, ctor, arg,
quoting=csv.QUOTE_ALL, quotechar='')
self.assertRaises(TypeError, ctor, arg,
quoting=csv.QUOTE_ALL, quotechar=None)
self.assertRaises(TypeError, ctor, arg,
quoting=csv.QUOTE_NONE, quotechar='')
self.assertRaises(ValueError, ctor, arg, delimiter='\n')
self.assertRaises(ValueError, ctor, arg, escapechar='\n')
self.assertRaises(ValueError, ctor, arg, quotechar='\n')
self.assertRaises(ValueError, ctor, arg, delimiter='\r')
self.assertRaises(ValueError, ctor, arg, escapechar='\r')
self.assertRaises(ValueError, ctor, arg, quotechar='\r')
ctor(arg, delimiter=' ')
ctor(arg, escapechar=' ')
ctor(arg, quotechar=' ')
ctor(arg, delimiter='\t', skipinitialspace=True)
ctor(arg, escapechar='\t', skipinitialspace=True)
ctor(arg, quotechar='\t', skipinitialspace=True)
ctor(arg, delimiter=' ', skipinitialspace=True)
self.assertRaises(ValueError, ctor, arg,
escapechar=' ', skipinitialspace=True)
self.assertRaises(ValueError, ctor, arg,
quotechar=' ', skipinitialspace=True)
ctor(arg, delimiter='^')
ctor(arg, escapechar='^')
ctor(arg, quotechar='^')
self.assertRaises(ValueError, ctor, arg, delimiter='^', escapechar='^')
self.assertRaises(ValueError, ctor, arg, delimiter='^', quotechar='^')
self.assertRaises(ValueError, ctor, arg, escapechar='^', quotechar='^')
ctor(arg, delimiter='\x85')
ctor(arg, escapechar='\x85')
ctor(arg, quotechar='\x85')
ctor(arg, lineterminator='\x85')
self.assertRaises(ValueError, ctor, arg,
delimiter='\x85', lineterminator='\x85')
self.assertRaises(ValueError, ctor, arg,
escapechar='\x85', lineterminator='\x85')
self.assertRaises(ValueError, ctor, arg,
quotechar='\x85', lineterminator='\x85')
def test_reader_arg_valid(self):
self._test_arg_valid(csv.reader, [])
self.assertRaises(OSError, csv.reader, BadIterable())
def test_writer_arg_valid(self):
self._test_arg_valid(csv.writer, StringIO())
class BadWriter:
@property
def write(self):
raise OSError
self.assertRaises(OSError, csv.writer, BadWriter())
def _test_default_attrs(self, ctor, *args):
obj = ctor(*args)
# Check defaults
self.assertEqual(obj.dialect.delimiter, ',')
self.assertIs(obj.dialect.doublequote, True)
self.assertEqual(obj.dialect.escapechar, None)
self.assertEqual(obj.dialect.lineterminator, "\r\n")
self.assertEqual(obj.dialect.quotechar, '"')
self.assertEqual(obj.dialect.quoting, csv.QUOTE_MINIMAL)
self.assertIs(obj.dialect.skipinitialspace, False)
self.assertIs(obj.dialect.strict, False)
# Try deleting or changing attributes (they are read-only)
self.assertRaises(AttributeError, delattr, obj.dialect, 'delimiter')
self.assertRaises(AttributeError, setattr, obj.dialect, 'delimiter', ':')
self.assertRaises(AttributeError, delattr, obj.dialect, 'quoting')
self.assertRaises(AttributeError, setattr, obj.dialect,
'quoting', None)
def test_reader_attrs(self):
self._test_default_attrs(csv.reader, [])
def test_writer_attrs(self):
self._test_default_attrs(csv.writer, StringIO())
def _test_kw_attrs(self, ctor, *args):
# Now try with alternate options
kwargs = dict(delimiter=':', doublequote=False, escapechar='\\',
lineterminator='\r', quotechar='*',
quoting=csv.QUOTE_NONE, skipinitialspace=True,
strict=True)
obj = ctor(*args, **kwargs)
self.assertEqual(obj.dialect.delimiter, ':')
self.assertIs(obj.dialect.doublequote, False)
self.assertEqual(obj.dialect.escapechar, '\\')
self.assertEqual(obj.dialect.lineterminator, "\r")
self.assertEqual(obj.dialect.quotechar, '*')
self.assertEqual(obj.dialect.quoting, csv.QUOTE_NONE)
self.assertIs(obj.dialect.skipinitialspace, True)
self.assertIs(obj.dialect.strict, True)
def test_reader_kw_attrs(self):
self._test_kw_attrs(csv.reader, [])
def test_writer_kw_attrs(self):
self._test_kw_attrs(csv.writer, StringIO())
def _test_dialect_attrs(self, ctor, *args):
# Now try with dialect-derived options
class dialect:
delimiter='-'
doublequote=False
escapechar='^'
lineterminator='$'
quotechar='#'
quoting=csv.QUOTE_ALL
skipinitialspace=True
strict=False
args = args + (dialect,)
obj = ctor(*args)
self.assertEqual(obj.dialect.delimiter, '-')
self.assertIs(obj.dialect.doublequote, False)
self.assertEqual(obj.dialect.escapechar, '^')
self.assertEqual(obj.dialect.lineterminator, "$")
self.assertEqual(obj.dialect.quotechar, '#')
self.assertEqual(obj.dialect.quoting, csv.QUOTE_ALL)
self.assertIs(obj.dialect.skipinitialspace, True)
self.assertIs(obj.dialect.strict, False)
def test_reader_dialect_attrs(self):
self._test_dialect_attrs(csv.reader, [])
def test_writer_dialect_attrs(self):
self._test_dialect_attrs(csv.writer, StringIO())
def _write_test(self, fields, expect, **kwargs):
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
writer = csv.writer(fileobj, **kwargs)
writer.writerow(fields)
fileobj.seek(0)
self.assertEqual(fileobj.read(),
expect + writer.dialect.lineterminator)
def _write_error_test(self, exc, fields, **kwargs):
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
writer = csv.writer(fileobj, **kwargs)
with self.assertRaises(exc):
writer.writerow(fields)
fileobj.seek(0)
self.assertEqual(fileobj.read(), '')
def test_write_arg_valid(self):
self._write_error_test(csv.Error, None)
# Check that exceptions are passed up the chain
self._write_error_test(OSError, BadIterable())
class BadList:
def __len__(self):
return 10
def __getitem__(self, i):
if i > 2:
raise OSError
self._write_error_test(OSError, BadList())
class BadItem:
def __str__(self):
raise OSError
self._write_error_test(OSError, [BadItem()])
def test_write_bigfield(self):
# This exercises the buffer realloc functionality
bigstring = 'X' * 50000
self._write_test([bigstring,bigstring], '%s,%s' % \
(bigstring, bigstring))
def test_write_quoting(self):
self._write_test(['a',1,'p,q'], 'a,1,"p,q"')
self._write_error_test(csv.Error, ['a',1,'p,q'],
quoting = csv.QUOTE_NONE)
self._write_test(['a',1,'p,q'], 'a,1,"p,q"',
quoting = csv.QUOTE_MINIMAL)
self._write_test(['a',1,'p,q'], '"a",1,"p,q"',
quoting = csv.QUOTE_NONNUMERIC)
self._write_test(['a',1,'p,q'], '"a","1","p,q"',
quoting = csv.QUOTE_ALL)
self._write_test(['a\nb',1], '"a\nb","1"',
quoting = csv.QUOTE_ALL)
self._write_test(['a','',None,1], '"a","",,1',
quoting = csv.QUOTE_STRINGS)
self._write_test(['a','',None,1], '"a","",,"1"',
quoting = csv.QUOTE_NOTNULL)
def test_write_escape(self):
self._write_test(['a',1,'p,q'], 'a,1,"p,q"',
escapechar='\\')
self._write_error_test(csv.Error, ['a',1,'p,"q"'],
escapechar=None, doublequote=False)
self._write_test(['a',1,'p,"q"'], 'a,1,"p,\\"q\\""',
escapechar='\\', doublequote = False)
self._write_test(['"'], '""""',
escapechar='\\', quoting = csv.QUOTE_MINIMAL)
self._write_test(['"'], '\\"',
escapechar='\\', quoting = csv.QUOTE_MINIMAL,
doublequote = False)
self._write_test(['"'], '\\"',
escapechar='\\', quoting = csv.QUOTE_NONE)
self._write_test(['a',1,'p,q'], 'a,1,p\\,q',
escapechar='\\', quoting = csv.QUOTE_NONE)
self._write_test(['\\', 'a'], '\\\\,a',
escapechar='\\', quoting=csv.QUOTE_NONE)
self._write_test(['\\', 'a'], '\\\\,a',
escapechar='\\', quoting=csv.QUOTE_MINIMAL)
self._write_test(['\\', 'a'], '"\\\\","a"',
escapechar='\\', quoting=csv.QUOTE_ALL)
self._write_test(['\\ ', 'a'], '\\\\ ,a',
escapechar='\\', quoting=csv.QUOTE_MINIMAL)
self._write_test(['\\,', 'a'], '\\\\\\,,a',
escapechar='\\', quoting=csv.QUOTE_NONE)
self._write_test([',\\', 'a'], '",\\\\",a',
escapechar='\\', quoting=csv.QUOTE_MINIMAL)
self._write_test(['C\\', '6', '7', 'X"'], 'C\\\\,6,7,"X"""',
escapechar='\\', quoting=csv.QUOTE_MINIMAL)
def test_write_lineterminator(self):
for lineterminator in '\r\n', '\n', '\r', '!@#', '\0':
with self.subTest(lineterminator=lineterminator):
with StringIO() as sio:
writer = csv.writer(sio, lineterminator=lineterminator)
writer.writerow(['a', 'b'])
writer.writerow([1, 2])
writer.writerow(['\r', '\n'])
self.assertEqual(sio.getvalue(),
f'a,b{lineterminator}'
f'1,2{lineterminator}'
f'"\r","\n"{lineterminator}')
def test_write_iterable(self):
self._write_test(iter(['a', 1, 'p,q']), 'a,1,"p,q"')
self._write_test(iter(['a', 1, None]), 'a,1,')
self._write_test(iter([]), '')
self._write_test(iter([None]), '""')
self._write_error_test(csv.Error, iter([None]), quoting=csv.QUOTE_NONE)
self._write_test(iter([None, None]), ',')
def test_writerows(self):
class BrokenFile:
def write(self, buf):
raise OSError
writer = csv.writer(BrokenFile())
self.assertRaises(OSError, writer.writerows, [['a']])
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
writer = csv.writer(fileobj)
self.assertRaises(TypeError, writer.writerows, None)
writer.writerows([['a', 'b'], ['c', 'd']])
fileobj.seek(0)
self.assertEqual(fileobj.read(), "a,b\r\nc,d\r\n")
def test_writerows_with_none(self):
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
writer = csv.writer(fileobj)
writer.writerows([['a', None], [None, 'd']])
fileobj.seek(0)
self.assertEqual(fileobj.read(), "a,\r\n,d\r\n")
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
writer = csv.writer(fileobj)
writer.writerows([[None], ['a']])
fileobj.seek(0)
self.assertEqual(fileobj.read(), '""\r\na\r\n')
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
writer = csv.writer(fileobj)
writer.writerows([['a'], [None]])
fileobj.seek(0)
self.assertEqual(fileobj.read(), 'a\r\n""\r\n')
def test_write_empty_fields(self):
self._write_test((), '')
self._write_test([''], '""')
self._write_error_test(csv.Error, [''], quoting=csv.QUOTE_NONE)
self._write_test([''], '""', quoting=csv.QUOTE_STRINGS)
self._write_test([''], '""', quoting=csv.QUOTE_NOTNULL)
self._write_test([None], '""')
self._write_error_test(csv.Error, [None], quoting=csv.QUOTE_NONE)
self._write_error_test(csv.Error, [None], quoting=csv.QUOTE_STRINGS)
self._write_error_test(csv.Error, [None], quoting=csv.QUOTE_NOTNULL)
self._write_test(['', ''], ',')
self._write_test([None, None], ',')
def test_write_empty_fields_space_delimiter(self):
self._write_test([''], '""', delimiter=' ', skipinitialspace=False)
self._write_test([''], '""', delimiter=' ', skipinitialspace=True)
self._write_test([None], '""', delimiter=' ', skipinitialspace=False)
self._write_test([None], '""', delimiter=' ', skipinitialspace=True)
self._write_test(['', ''], ' ', delimiter=' ', skipinitialspace=False)
self._write_test(['', ''], '"" ""', delimiter=' ', skipinitialspace=True)
self._write_test([None, None], ' ', delimiter=' ', skipinitialspace=False)
self._write_test([None, None], '"" ""', delimiter=' ', skipinitialspace=True)
self._write_test(['', ''], ' ', delimiter=' ', skipinitialspace=False,
quoting=csv.QUOTE_NONE)
self._write_error_test(csv.Error, ['', ''],
delimiter=' ', skipinitialspace=True,
quoting=csv.QUOTE_NONE)
for quoting in csv.QUOTE_STRINGS, csv.QUOTE_NOTNULL:
self._write_test(['', ''], '"" ""', delimiter=' ', skipinitialspace=False,
quoting=quoting)
self._write_test(['', ''], '"" ""', delimiter=' ', skipinitialspace=True,
quoting=quoting)
for quoting in csv.QUOTE_NONE, csv.QUOTE_STRINGS, csv.QUOTE_NOTNULL:
self._write_test([None, None], ' ', delimiter=' ', skipinitialspace=False,
quoting=quoting)
self._write_error_test(csv.Error, [None, None],
delimiter=' ', skipinitialspace=True,
quoting=quoting)
def test_writerows_errors(self):
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
writer = csv.writer(fileobj)
self.assertRaises(TypeError, writer.writerows, None)
self.assertRaises(OSError, writer.writerows, BadIterable())
def _read_test(self, input, expect, **kwargs):
reader = csv.reader(input, **kwargs)
result = list(reader)
self.assertEqual(result, expect)
def test_read_oddinputs(self):
self._read_test([], [])
self._read_test([''], [[]])
self.assertRaises(csv.Error, self._read_test,
['"ab"c'], None, strict = 1)
self._read_test(['"ab"c'], [['abc']], doublequote = 0)
self.assertRaises(csv.Error, self._read_test,
[b'abc'], None)
def test_read_eol(self):
self._read_test(['a,b', 'c,d'], [['a','b'], ['c','d']])
self._read_test(['a,b\n', 'c,d\n'], [['a','b'], ['c','d']])
self._read_test(['a,b\r\n', 'c,d\r\n'], [['a','b'], ['c','d']])
self._read_test(['a,b\r', 'c,d\r'], [['a','b'], ['c','d']])
errmsg = "with newline=''"
with self.assertRaisesRegex(csv.Error, errmsg):
next(csv.reader(['a,b\rc,d']))
with self.assertRaisesRegex(csv.Error, errmsg):
next(csv.reader(['a,b\nc,d']))
with self.assertRaisesRegex(csv.Error, errmsg):
next(csv.reader(['a,b\r\nc,d']))
def test_read_eof(self):
self._read_test(['a,"'], [['a', '']])
self._read_test(['"a'], [['a']])
self._read_test(['^'], [['\n']], escapechar='^')
self.assertRaises(csv.Error, self._read_test, ['a,"'], [], strict=True)
self.assertRaises(csv.Error, self._read_test, ['"a'], [], strict=True)
self.assertRaises(csv.Error, self._read_test,
['^'], [], escapechar='^', strict=True)
def test_read_nul(self):
self._read_test(['\0'], [['\0']])
self._read_test(['a,\0b,c'], [['a', '\0b', 'c']])
self._read_test(['a,b\0,c'], [['a', 'b\0', 'c']])
self._read_test(['a,b\\\0,c'], [['a', 'b\0', 'c']], escapechar='\\')
self._read_test(['a,"\0b",c'], [['a', '\0b', 'c']])
def test_read_delimiter(self):
self._read_test(['a,b,c'], [['a', 'b', 'c']])
self._read_test(['a;b;c'], [['a', 'b', 'c']], delimiter=';')
self._read_test(['a\0b\0c'], [['a', 'b', 'c']], delimiter='\0')
def test_read_escape(self):
self._read_test(['a,\\b,c'], [['a', 'b', 'c']], escapechar='\\')
self._read_test(['a,b\\,c'], [['a', 'b,c']], escapechar='\\')
self._read_test(['a,"b\\,c"'], [['a', 'b,c']], escapechar='\\')
self._read_test(['a,"b,\\c"'], [['a', 'b,c']], escapechar='\\')
self._read_test(['a,"b,c\\""'], [['a', 'b,c"']], escapechar='\\')
self._read_test(['a,"b,c"\\'], [['a', 'b,c\\']], escapechar='\\')
self._read_test(['a,^b,c'], [['a', 'b', 'c']], escapechar='^')
self._read_test(['a,\0b,c'], [['a', 'b', 'c']], escapechar='\0')
self._read_test(['a,\\b,c'], [['a', '\\b', 'c']], escapechar=None)
self._read_test(['a,\\b,c'], [['a', '\\b', 'c']])
def test_read_quoting(self):
self._read_test(['1,",3,",5'], [['1', ',3,', '5']])
self._read_test(['1,",3,",5'], [['1', '"', '3', '"', '5']],
quotechar=None, escapechar='\\')
self._read_test(['1,",3,",5'], [['1', '"', '3', '"', '5']],
quoting=csv.QUOTE_NONE, escapechar='\\')
# will this fail where locale uses comma for decimals?
self._read_test([',3,"5",7.3, 9'], [['', 3, '5', 7.3, 9]],
quoting=csv.QUOTE_NONNUMERIC)
self._read_test([',3,"5",7.3, 9'], [[None, '3', '5', '7.3', ' 9']],
quoting=csv.QUOTE_NOTNULL)
self._read_test([',3,"5",7.3, 9'], [[None, 3, '5', 7.3, 9]],
quoting=csv.QUOTE_STRINGS)
self._read_test([',,"",'], [['', '', '', '']])
self._read_test([',,"",'], [['', '', '', '']],
quoting=csv.QUOTE_NONNUMERIC)
self._read_test([',,"",'], [[None, None, '', None]],
quoting=csv.QUOTE_NOTNULL)
self._read_test([',,"",'], [[None, None, '', None]],
quoting=csv.QUOTE_STRINGS)
self._read_test(['"a\nb", 7'], [['a\nb', ' 7']])
self.assertRaises(ValueError, self._read_test,
['abc,3'], [[]],
quoting=csv.QUOTE_NONNUMERIC)
self.assertRaises(ValueError, self._read_test,
['abc,3'], [[]],
quoting=csv.QUOTE_STRINGS)
self._read_test(['1,@,3,@,5'], [['1', ',3,', '5']], quotechar='@')
self._read_test(['1,\0,3,\0,5'], [['1', ',3,', '5']], quotechar='\0')
self._read_test(['1\\.5,\\.5,.5'], [[1.5, 0.5, 0.5]],
quoting=csv.QUOTE_NONNUMERIC, escapechar='\\')
self._read_test(['1\\.5,\\.5,"\\.5"'], [[1.5, 0.5, ".5"]],
quoting=csv.QUOTE_STRINGS, escapechar='\\')
def test_read_skipinitialspace(self):
self._read_test(['no space, space, spaces,\ttab'],
[['no space', 'space', 'spaces', '\ttab']],
skipinitialspace=True)
self._read_test([' , , '],
[['', '', '']],
skipinitialspace=True)
self._read_test([' , , '],
[[None, None, None]],
skipinitialspace=True, quoting=csv.QUOTE_NOTNULL)
self._read_test([' , , '],
[[None, None, None]],
skipinitialspace=True, quoting=csv.QUOTE_STRINGS)
def test_read_space_delimiter(self):
self._read_test(['a b', ' a ', ' ', ''],
[['a', '', '', 'b'], ['', '', 'a', '', ''], ['', '', ''], []],
delimiter=' ', skipinitialspace=False)
self._read_test(['a b', ' a ', ' ', ''],
[['a', 'b'], ['a', ''], [''], []],
delimiter=' ', skipinitialspace=True)
def test_read_bigfield(self):
# This exercises the buffer realloc functionality and field size
# limits.
limit = csv.field_size_limit()
try:
size = 50000
bigstring = 'X' * size
bigline = '%s,%s' % (bigstring, bigstring)
self._read_test([bigline], [[bigstring, bigstring]])
csv.field_size_limit(size)
self._read_test([bigline], [[bigstring, bigstring]])
self.assertEqual(csv.field_size_limit(), size)
csv.field_size_limit(size-1)
self.assertRaises(csv.Error, self._read_test, [bigline], [])
self.assertRaises(TypeError, csv.field_size_limit, None)
self.assertRaises(TypeError, csv.field_size_limit, 1, None)
finally:
csv.field_size_limit(limit)
def test_read_linenum(self):
r = csv.reader(['line,1', 'line,2', 'line,3'])
self.assertEqual(r.line_num, 0)
next(r)
self.assertEqual(r.line_num, 1)
next(r)
self.assertEqual(r.line_num, 2)
next(r)
self.assertEqual(r.line_num, 3)
self.assertRaises(StopIteration, next, r)
self.assertEqual(r.line_num, 3)
def test_roundtrip_quoteed_newlines(self):
rows = [
['\na', 'b\nc', 'd\n'],
['\re', 'f\rg', 'h\r'],
['\r\ni', 'j\r\nk', 'l\r\n'],
['\n\rm', 'n\n\ro', 'p\n\r'],
['\r\rq', 'r\r\rs', 't\r\r'],
['\n\nu', 'v\n\nw', 'x\n\n'],
]
for lineterminator in '\r\n', '\n', '\r':
with self.subTest(lineterminator=lineterminator):
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
writer = csv.writer(fileobj, lineterminator=lineterminator)
writer.writerows(rows)
fileobj.seek(0)
for i, row in enumerate(csv.reader(fileobj)):
self.assertEqual(row, rows[i])
def test_roundtrip_escaped_unquoted_newlines(self):
rows = [
['\na', 'b\nc', 'd\n'],
['\re', 'f\rg', 'h\r'],
['\r\ni', 'j\r\nk', 'l\r\n'],
['\n\rm', 'n\n\ro', 'p\n\r'],
['\r\rq', 'r\r\rs', 't\r\r'],
['\n\nu', 'v\n\nw', 'x\n\n'],
]
for lineterminator in '\r\n', '\n', '\r':
with self.subTest(lineterminator=lineterminator):
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
writer = csv.writer(fileobj, lineterminator=lineterminator,
quoting=csv.QUOTE_NONE, escapechar="\\")
writer.writerows(rows)
fileobj.seek(0)
for i, row in enumerate(csv.reader(fileobj,
quoting=csv.QUOTE_NONE,
escapechar="\\")):
self.assertEqual(row, rows[i])
class TestDialectRegistry(unittest.TestCase):
def test_registry_badargs(self):
self.assertRaises(TypeError, csv.list_dialects, None)
self.assertRaises(TypeError, csv.get_dialect)
self.assertRaises(csv.Error, csv.get_dialect, None)
self.assertRaises(csv.Error, csv.get_dialect, "nonesuch")
self.assertRaises(TypeError, csv.unregister_dialect)
self.assertRaises(csv.Error, csv.unregister_dialect, None)
self.assertRaises(csv.Error, csv.unregister_dialect, "nonesuch")
self.assertRaises(TypeError, csv.register_dialect, None)
self.assertRaises(TypeError, csv.register_dialect, None, None)
self.assertRaises(TypeError, csv.register_dialect, "nonesuch", 0, 0)
self.assertRaises(TypeError, csv.register_dialect, "nonesuch",
badargument=None)
self.assertRaises(TypeError, csv.register_dialect, "nonesuch",
quoting=None)
self.assertRaises(TypeError, csv.register_dialect, [])
def test_registry(self):
class myexceltsv(csv.excel):
delimiter = "\t"
name = "myexceltsv"
expected_dialects = csv.list_dialects() + [name]
expected_dialects.sort()
csv.register_dialect(name, myexceltsv)
self.addCleanup(csv.unregister_dialect, name)
self.assertEqual(csv.get_dialect(name).delimiter, '\t')
got_dialects = sorted(csv.list_dialects())
self.assertEqual(expected_dialects, got_dialects)
def test_register_kwargs(self):
name = 'fedcba'
csv.register_dialect(name, delimiter=';')
self.addCleanup(csv.unregister_dialect, name)
self.assertEqual(csv.get_dialect(name).delimiter, ';')
self.assertEqual([['X', 'Y', 'Z']], list(csv.reader(['X;Y;Z'], name)))
def test_register_kwargs_override(self):
class mydialect(csv.Dialect):
delimiter = "\t"
quotechar = '"'
doublequote = True
skipinitialspace = False
lineterminator = '\r\n'
quoting = csv.QUOTE_MINIMAL
name = 'test_dialect'
csv.register_dialect(name, mydialect,
delimiter=';',
quotechar="'",
doublequote=False,
skipinitialspace=True,
lineterminator='\n',
quoting=csv.QUOTE_ALL)
self.addCleanup(csv.unregister_dialect, name)
# Ensure that kwargs do override attributes of a dialect class:
dialect = csv.get_dialect(name)
self.assertEqual(dialect.delimiter, ';')
self.assertEqual(dialect.quotechar, "'")
self.assertEqual(dialect.doublequote, False)
self.assertEqual(dialect.skipinitialspace, True)
self.assertEqual(dialect.lineterminator, '\n')
self.assertEqual(dialect.quoting, csv.QUOTE_ALL)
def test_incomplete_dialect(self):
class myexceltsv(csv.Dialect):
delimiter = "\t"
self.assertRaises(csv.Error, myexceltsv)
def test_space_dialect(self):
class space(csv.excel):
delimiter = " "
quoting = csv.QUOTE_NONE
escapechar = "\\"
with TemporaryFile("w+", encoding="utf-8") as fileobj:
fileobj.write("abc def\nc1ccccc1 benzene\n")
fileobj.seek(0)
reader = csv.reader(fileobj, dialect=space())
self.assertEqual(next(reader), ["abc", "", "", "def"])
self.assertEqual(next(reader), ["c1ccccc1", "benzene"])
def compare_dialect_123(self, expected, *writeargs, **kwwriteargs):
with TemporaryFile("w+", newline='', encoding="utf-8") as fileobj:
writer = csv.writer(fileobj, *writeargs, **kwwriteargs)
writer.writerow([1,2,3])
fileobj.seek(0)
self.assertEqual(fileobj.read(), expected)
def test_dialect_apply(self):
class testA(csv.excel):
delimiter = "\t"
class testB(csv.excel):
delimiter = ":"
class testC(csv.excel):
delimiter = "|"
class testUni(csv.excel):
delimiter = "\u039B"
class unspecified():
# A class to pass as dialect but with no dialect attributes.
pass
csv.register_dialect('testC', testC)
try:
self.compare_dialect_123("1,2,3\r\n")
self.compare_dialect_123("1,2,3\r\n", dialect=None)
self.compare_dialect_123("1,2,3\r\n", dialect=unspecified)
self.compare_dialect_123("1\t2\t3\r\n", testA)
self.compare_dialect_123("1:2:3\r\n", dialect=testB())
self.compare_dialect_123("1|2|3\r\n", dialect='testC')
self.compare_dialect_123("1;2;3\r\n", dialect=testA,
delimiter=';')
self.compare_dialect_123("1\u039B2\u039B3\r\n",
dialect=testUni)
finally:
csv.unregister_dialect('testC')
def test_copy(self):
for name in csv.list_dialects():
dialect = csv.get_dialect(name)
self.assertRaises(TypeError, copy.copy, dialect)
def test_pickle(self):
for name in csv.list_dialects():
dialect = csv.get_dialect(name)
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
self.assertRaises(TypeError, pickle.dumps, dialect, proto)
class TestCsvBase(unittest.TestCase):
def readerAssertEqual(self, input, expected_result):
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
fileobj.write(input)
fileobj.seek(0)
reader = csv.reader(fileobj, dialect = self.dialect)
fields = list(reader)
self.assertEqual(fields, expected_result)
def writerAssertEqual(self, input, expected_result):
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
writer = csv.writer(fileobj, dialect = self.dialect)
writer.writerows(input)
fileobj.seek(0)
self.assertEqual(fileobj.read(), expected_result)
class TestDialectExcel(TestCsvBase):
dialect = 'excel'
def test_single(self):
self.readerAssertEqual('abc', [['abc']])
def test_simple(self):
self.readerAssertEqual('1,2,3,4,5', [['1','2','3','4','5']])
def test_blankline(self):
self.readerAssertEqual('', [])
def test_empty_fields(self):
self.readerAssertEqual(',', [['', '']])
def test_singlequoted(self):
self.readerAssertEqual('""', [['']])
def test_singlequoted_left_empty(self):
self.readerAssertEqual('"",', [['','']])
def test_singlequoted_right_empty(self):
self.readerAssertEqual(',""', [['','']])
def test_single_quoted_quote(self):
self.readerAssertEqual('""""', [['"']])
def test_quoted_quotes(self):
self.readerAssertEqual('""""""', [['""']])
def test_inline_quote(self):
self.readerAssertEqual('a""b', [['a""b']])
def test_inline_quotes(self):
self.readerAssertEqual('a"b"c', [['a"b"c']])
def test_quotes_and_more(self):
# Excel would never write a field containing '"a"b', but when
# reading one, it will return 'ab'.
self.readerAssertEqual('"a"b', [['ab']])
def test_lone_quote(self):
self.readerAssertEqual('a"b', [['a"b']])
def test_quote_and_quote(self):
# Excel would never write a field containing '"a" "b"', but when
# reading one, it will return 'a "b"'.
self.readerAssertEqual('"a" "b"', [['a "b"']])
def test_space_and_quote(self):
self.readerAssertEqual(' "a"', [[' "a"']])
def test_quoted(self):
self.readerAssertEqual('1,2,3,"I think, therefore I am",5,6',
[['1', '2', '3',
'I think, therefore I am',
'5', '6']])
def test_quoted_quote(self):
self.readerAssertEqual('1,2,3,"""I see,"" said the blind man","as he picked up his hammer and saw"',
[['1', '2', '3',
'"I see," said the blind man',
'as he picked up his hammer and saw']])
def test_quoted_nl(self):
input = '''\
1,2,3,"""I see,""
said the blind man","as he picked up his
hammer and saw"
9,8,7,6'''
self.readerAssertEqual(input,
[['1', '2', '3',
'"I see,"\nsaid the blind man',
'as he picked up his\nhammer and saw'],
['9','8','7','6']])
def test_dubious_quote(self):
self.readerAssertEqual('12,12,1",', [['12', '12', '1"', '']])
def test_null(self):
self.writerAssertEqual([], '')
def test_single_writer(self):
self.writerAssertEqual([['abc']], 'abc\r\n')
def test_simple_writer(self):
self.writerAssertEqual([[1, 2, 'abc', 3, 4]], '1,2,abc,3,4\r\n')
def test_quotes(self):
self.writerAssertEqual([[1, 2, 'a"bc"', 3, 4]], '1,2,"a""bc""",3,4\r\n')
def test_quote_fieldsep(self):
self.writerAssertEqual([['abc,def']], '"abc,def"\r\n')
def test_newlines(self):
self.writerAssertEqual([[1, 2, 'a\nbc', 3, 4]], '1,2,"a\nbc",3,4\r\n')
class EscapedExcel(csv.excel):
quoting = csv.QUOTE_NONE
escapechar = '\\'
class TestEscapedExcel(TestCsvBase):
dialect = EscapedExcel()
def test_escape_fieldsep(self):
self.writerAssertEqual([['abc,def']], 'abc\\,def\r\n')
def test_read_escape_fieldsep(self):
self.readerAssertEqual('abc\\,def\r\n', [['abc,def']])
class TestDialectUnix(TestCsvBase):
dialect = 'unix'
def test_simple_writer(self):
self.writerAssertEqual([[1, 'abc def', 'abc']], '"1","abc def","abc"\n')
def test_simple_reader(self):
self.readerAssertEqual('"1","abc def","abc"\n', [['1', 'abc def', 'abc']])
class QuotedEscapedExcel(csv.excel):
quoting = csv.QUOTE_NONNUMERIC
escapechar = '\\'
class TestQuotedEscapedExcel(TestCsvBase):
dialect = QuotedEscapedExcel()
def test_write_escape_fieldsep(self):
self.writerAssertEqual([['abc,def']], '"abc,def"\r\n')
def test_read_escape_fieldsep(self):
self.readerAssertEqual('"abc\\,def"\r\n', [['abc,def']])
class TestDictFields(unittest.TestCase):
### "long" means the row is longer than the number of fieldnames
### "short" means there are fewer elements in the row than fieldnames
def test_writeheader_return_value(self):
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
writer = csv.DictWriter(fileobj, fieldnames = ["f1", "f2", "f3"])
writeheader_return_value = writer.writeheader()
self.assertEqual(writeheader_return_value, 10)
def test_write_simple_dict(self):
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
writer = csv.DictWriter(fileobj, fieldnames = ["f1", "f2", "f3"])
writer.writeheader()
fileobj.seek(0)
self.assertEqual(fileobj.readline(), "f1,f2,f3\r\n")
writer.writerow({"f1": 10, "f3": "abc"})
fileobj.seek(0)
fileobj.readline() # header
self.assertEqual(fileobj.read(), "10,,abc\r\n")
def test_write_multiple_dict_rows(self):
fileobj = StringIO()
writer = csv.DictWriter(fileobj, fieldnames=["f1", "f2", "f3"])
writer.writeheader()
self.assertEqual(fileobj.getvalue(), "f1,f2,f3\r\n")
writer.writerows([{"f1": 1, "f2": "abc", "f3": "f"},
{"f1": 2, "f2": 5, "f3": "xyz"}])
self.assertEqual(fileobj.getvalue(),
"f1,f2,f3\r\n1,abc,f\r\n2,5,xyz\r\n")
def test_write_no_fields(self):
fileobj = StringIO()
self.assertRaises(TypeError, csv.DictWriter, fileobj)
def test_write_fields_not_in_fieldnames(self):
with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj:
writer = csv.DictWriter(fileobj, fieldnames = ["f1", "f2", "f3"])
# Of special note is the non-string key (issue 19449)
with self.assertRaises(ValueError) as cx:
writer.writerow({"f4": 10, "f2": "spam", 1: "abc"})
exception = str(cx.exception)
self.assertIn("fieldnames", exception)
self.assertIn("'f4'", exception)
self.assertNotIn("'f2'", exception)
self.assertIn("1", exception)
def test_typo_in_extrasaction_raises_error(self):
fileobj = StringIO()
self.assertRaises(ValueError, csv.DictWriter, fileobj, ['f1', 'f2'],
extrasaction="raised")
def test_write_field_not_in_field_names_raise(self):
fileobj = StringIO()
writer = csv.DictWriter(fileobj, ['f1', 'f2'], extrasaction="raise")
dictrow = {'f0': 0, 'f1': 1, 'f2': 2, 'f3': 3}
self.assertRaises(ValueError, csv.DictWriter.writerow, writer, dictrow)
# see bpo-44512 (differently cased 'raise' should not result in 'ignore')
writer = csv.DictWriter(fileobj, ['f1', 'f2'], extrasaction="RAISE")
self.assertRaises(ValueError, csv.DictWriter.writerow, writer, dictrow)
def test_write_field_not_in_field_names_ignore(self):
fileobj = StringIO()
writer = csv.DictWriter(fileobj, ['f1', 'f2'], extrasaction="ignore")
dictrow = {'f0': 0, 'f1': 1, 'f2': 2, 'f3': 3}
csv.DictWriter.writerow(writer, dictrow)
self.assertEqual(fileobj.getvalue(), "1,2\r\n")
# bpo-44512
writer = csv.DictWriter(fileobj, ['f1', 'f2'], extrasaction="IGNORE")
csv.DictWriter.writerow(writer, dictrow)
def test_dict_reader_fieldnames_accepts_iter(self):
fieldnames = ["a", "b", "c"]
f = StringIO()
reader = csv.DictReader(f, iter(fieldnames))
self.assertEqual(reader.fieldnames, fieldnames)
def test_dict_reader_fieldnames_accepts_list(self):
fieldnames = ["a", "b", "c"]
f = StringIO()
reader = csv.DictReader(f, fieldnames)
self.assertEqual(reader.fieldnames, fieldnames)
def test_dict_writer_fieldnames_rejects_iter(self):
fieldnames = ["a", "b", "c"]
f = StringIO()
writer = csv.DictWriter(f, iter(fieldnames))
self.assertEqual(writer.fieldnames, fieldnames)
def test_dict_writer_fieldnames_accepts_list(self):
fieldnames = ["a", "b", "c"]
f = StringIO()
writer = csv.DictWriter(f, fieldnames)
self.assertEqual(writer.fieldnames, fieldnames)
def test_dict_reader_fieldnames_is_optional(self):
f = StringIO()
reader = csv.DictReader(f, fieldnames=None)
def test_read_dict_fields(self):
with TemporaryFile("w+", encoding="utf-8") as fileobj:
fileobj.write("1,2,abc\r\n")
fileobj.seek(0)
reader = csv.DictReader(fileobj,
fieldnames=["f1", "f2", "f3"])
self.assertEqual(next(reader), {"f1": '1', "f2": '2', "f3": 'abc'})
def test_read_dict_no_fieldnames(self):
with TemporaryFile("w+", encoding="utf-8") as fileobj:
fileobj.write("f1,f2,f3\r\n1,2,abc\r\n")
fileobj.seek(0)
reader = csv.DictReader(fileobj)
self.assertEqual(next(reader), {"f1": '1', "f2": '2', "f3": 'abc'})
self.assertEqual(reader.fieldnames, ["f1", "f2", "f3"])
# Two test cases to make sure existing ways of implicitly setting
# fieldnames continue to work. Both arise from discussion in issue3436.
def test_read_dict_fieldnames_from_file(self):
with TemporaryFile("w+", encoding="utf-8") as fileobj:
fileobj.write("f1,f2,f3\r\n1,2,abc\r\n")
fileobj.seek(0)
reader = csv.DictReader(fileobj,
fieldnames=next(csv.reader(fileobj)))
self.assertEqual(reader.fieldnames, ["f1", "f2", "f3"])
self.assertEqual(next(reader), {"f1": '1', "f2": '2', "f3": 'abc'})
def test_read_dict_fieldnames_chain(self):
import itertools
with TemporaryFile("w+", encoding="utf-8") as fileobj:
fileobj.write("f1,f2,f3\r\n1,2,abc\r\n")
fileobj.seek(0)
reader = csv.DictReader(fileobj)
first = next(reader)
for row in itertools.chain([first], reader):
self.assertEqual(reader.fieldnames, ["f1", "f2", "f3"])
self.assertEqual(row, {"f1": '1', "f2": '2', "f3": 'abc'})
def test_read_long(self):
with TemporaryFile("w+", encoding="utf-8") as fileobj:
fileobj.write("1,2,abc,4,5,6\r\n")
fileobj.seek(0)
reader = csv.DictReader(fileobj,
fieldnames=["f1", "f2"])
self.assertEqual(next(reader), {"f1": '1', "f2": '2',
None: ["abc", "4", "5", "6"]})
def test_read_long_with_rest(self):
with TemporaryFile("w+", encoding="utf-8") as fileobj:
fileobj.write("1,2,abc,4,5,6\r\n")
fileobj.seek(0)
reader = csv.DictReader(fileobj,
fieldnames=["f1", "f2"], restkey="_rest")
self.assertEqual(next(reader), {"f1": '1', "f2": '2',
"_rest": ["abc", "4", "5", "6"]})
def test_read_long_with_rest_no_fieldnames(self):
with TemporaryFile("w+", encoding="utf-8") as fileobj:
fileobj.write("f1,f2\r\n1,2,abc,4,5,6\r\n")
fileobj.seek(0)
reader = csv.DictReader(fileobj, restkey="_rest")
self.assertEqual(reader.fieldnames, ["f1", "f2"])
self.assertEqual(next(reader), {"f1": '1', "f2": '2',
"_rest": ["abc", "4", "5", "6"]})