cpython/Lib/test/test_csv.py

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# Copyright (C) 2001,2002 Python Software Foundation
# csv package unit tests
import sys
import unittest
from StringIO import StringIO
import csv
import gc
from test.test_support import verbose
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_reader_arg_valid(self):
self.assertRaises(TypeError, csv.reader)
self.assertRaises(TypeError, csv.reader, None)
self.assertRaises(AttributeError, csv.reader, [], bad_attr = 0)
self.assertRaises(csv.Error, csv.reader, [], 'foo')
class BadClass:
def __init__(self):
raise IOError
self.assertRaises(IOError, csv.reader, [], BadClass)
self.assertRaises(TypeError, csv.reader, [], None)
class BadDialect:
bad_attr = 0
self.assertRaises(AttributeError, csv.reader, [], BadDialect)
def test_writer_arg_valid(self):
self.assertRaises(TypeError, csv.writer)
self.assertRaises(TypeError, csv.writer, None)
self.assertRaises(AttributeError, csv.writer, StringIO(), bad_attr = 0)
def _test_attrs(self, obj):
self.assertEqual(obj.dialect.delimiter, ',')
obj.dialect.delimiter = '\t'
self.assertEqual(obj.dialect.delimiter, '\t')
self.assertRaises(TypeError, delattr, obj.dialect, 'delimiter')
self.assertRaises(TypeError, setattr, obj.dialect,
'lineterminator', None)
obj.dialect.escapechar = None
self.assertEqual(obj.dialect.escapechar, None)
self.assertRaises(TypeError, delattr, obj.dialect, 'quoting')
self.assertRaises(TypeError, setattr, obj.dialect, 'quoting', None)
obj.dialect.quoting = csv.QUOTE_MINIMAL
self.assertEqual(obj.dialect.quoting, csv.QUOTE_MINIMAL)
def test_reader_attrs(self):
self._test_attrs(csv.reader([]))
def test_writer_attrs(self):
self._test_attrs(csv.writer(StringIO()))
def _write_test(self, fields, expect, **kwargs):
fileobj = StringIO()
writer = csv.writer(fileobj, **kwargs)
writer.writerow(fields)
self.assertEqual(fileobj.getvalue(),
expect + writer.dialect.lineterminator)
def test_write_arg_valid(self):
self.assertRaises(csv.Error, self._write_test, None, '')
self._write_test((), '')
self._write_test([None], '""')
self.assertRaises(csv.Error, self._write_test,
[None], None, quoting = csv.QUOTE_NONE)
# Check that exceptions are passed up the chain
class BadList:
def __len__(self):
return 10;
def __getitem__(self, i):
if i > 2:
raise IOError
self.assertRaises(IOError, self._write_test, BadList(), '')
class BadItem:
def __str__(self):
raise IOError
self.assertRaises(IOError, self._write_test, [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.assertRaises(csv.Error,
self._write_test,
['a','1','p,q'], '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)
def test_write_escape(self):
self._write_test(['a','1','p,q'], 'a,1,"p,q"',
escapechar='\\')
# FAILED - needs to be fixed [am]:
# self._write_test(['a','1','p,"q"'], 'a,1,"p,\\"q\\"',
# escapechar='\\', doublequote = 0)
self._write_test(['a','1','p,q'], 'a,1,p\\,q',
escapechar='\\', quoting = csv.QUOTE_NONE)
def test_writerows(self):
class BrokenFile:
def write(self, buf):
raise IOError
writer = csv.writer(BrokenFile())
self.assertRaises(IOError, writer.writerows, [['a']])
fileobj = StringIO()
writer = csv.writer(fileobj)
self.assertRaises(TypeError, writer.writerows, None)
writer.writerows([['a','b'],['c','d']])
self.assertEqual(fileobj.getvalue(), "a,b\r\nc,d\r\n")
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)
# cannot handle null bytes for the moment
self.assertRaises(csv.Error, self._read_test,
['ab\0c'], None, strict = 1)
self._read_test(['"ab"c'], [['abc']], doublequote = 0)
def test_read_eol(self):
self._read_test(['a,b'], [['a','b']])
self._read_test(['a,b\n'], [['a','b']])
self._read_test(['a,b\r\n'], [['a','b']])
self._read_test(['a,b\r'], [['a','b']])
self.assertRaises(csv.Error, self._read_test, ['a,b\rc,d'], [])
self.assertRaises(csv.Error, self._read_test, ['a,b\nc,d'], [])
self.assertRaises(csv.Error, self._read_test, ['a,b\r\nc,d'], [])
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='\\')
def test_read_bigfield(self):
# This exercises the buffer realloc functionality
bigstring = 'X' * 50000
bigline = '%s,%s' % (bigstring, bigstring)
self._read_test([bigline], [[bigstring, bigstring]])
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", None)
class bogus:
def __init__(self):
raise KeyError
self.assertRaises(KeyError, csv.register_dialect, "nonesuch", bogus)
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)
try:
self.failUnless(isinstance(csv.get_dialect(name), myexceltsv))
got_dialects = csv.list_dialects()
got_dialects.sort()
self.assertEqual(expected_dialects, got_dialects)
finally:
csv.unregister_dialect(name)
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 = "\\"
s = StringIO("abc def\nc1ccccc1 benzene\n")
rdr = csv.reader(s, dialect=space())
self.assertEqual(rdr.next(), ["abc", "def"])
self.assertEqual(rdr.next(), ["c1ccccc1", "benzene"])
def test_dialect_apply(self):
class testA(csv.excel):
delimiter = "\t"
class testB(csv.excel):
delimiter = ":"
class testC(csv.excel):
delimiter = "|"
csv.register_dialect('testC', testC)
try:
fileobj = StringIO()
writer = csv.writer(fileobj)
writer.writerow([1,2,3])
self.assertEqual(fileobj.getvalue(), "1,2,3\r\n")
fileobj = StringIO()
writer = csv.writer(fileobj, testA)
writer.writerow([1,2,3])
self.assertEqual(fileobj.getvalue(), "1\t2\t3\r\n")
fileobj = StringIO()
writer = csv.writer(fileobj, dialect=testB())
writer.writerow([1,2,3])
self.assertEqual(fileobj.getvalue(), "1:2:3\r\n")
fileobj = StringIO()
writer = csv.writer(fileobj, dialect='testC')
writer.writerow([1,2,3])
self.assertEqual(fileobj.getvalue(), "1|2|3\r\n")
fileobj = StringIO()
writer = csv.writer(fileobj, dialect=testA, delimiter=';')
writer.writerow([1,2,3])
self.assertEqual(fileobj.getvalue(), "1;2;3\r\n")
finally:
csv.unregister_dialect('testC')
def test_bad_dialect(self):
# Unknown parameter
self.assertRaises(AttributeError, csv.reader, [], bad_attr = 0)
# Bad values
self.assertRaises(TypeError, csv.reader, [], delimiter = None)
self.assertRaises(TypeError, csv.reader, [], quoting = -1)
self.assertRaises(TypeError, csv.reader, [], quoting = 100)
class TestCsvBase(unittest.TestCase):
def readerAssertEqual(self, input, expected_result):
reader = csv.reader(StringIO(input), dialect = self.dialect)
fields = list(reader)
self.assertEqual(fields, expected_result)
def writerAssertEqual(self, input, expected_result):
fileobj = StringIO()
writer = csv.writer(fileobj, dialect = self.dialect)
writer.writerows(input)
self.assertEqual(fileobj.getvalue(), 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):
self.readerAssertEqual('"a"b', [['ab']])
def test_lone_quote(self):
self.readerAssertEqual('a"b', [['a"b']])
def test_quote_and_quote(self):
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(self):
self.writerAssertEqual([['abc']], 'abc\r\n')
def test_simple(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 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']])
# Disabled, pending support in csv.utils module
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_write_simple_dict(self):
fileobj = StringIO()
writer = csv.DictWriter(fileobj, fieldnames = ["f1", "f2", "f3"])
writer.writerow({"f1": 10, "f3": "abc"})
self.assertEqual(fileobj.getvalue(), "10,,abc\r\n")
def test_write_no_fields(self):
fileobj = StringIO()
self.assertRaises(TypeError, csv.DictWriter, fileobj)
def test_read_dict_fields(self):
reader = csv.DictReader(StringIO("1,2,abc\r\n"),
fieldnames=["f1", "f2", "f3"])
self.assertEqual(reader.next(), {"f1": '1', "f2": '2', "f3": 'abc'})
def test_read_long(self):
reader = csv.DictReader(StringIO("1,2,abc,4,5,6\r\n"),
fieldnames=["f1", "f2"])
self.assertEqual(reader.next(), {"f1": '1', "f2": '2',
None: ["abc", "4", "5", "6"]})
def test_read_long_with_rest(self):
reader = csv.DictReader(StringIO("1,2,abc,4,5,6\r\n"),
fieldnames=["f1", "f2"], restkey="_rest")
self.assertEqual(reader.next(), {"f1": '1', "f2": '2',
"_rest": ["abc", "4", "5", "6"]})
def test_read_short(self):
reader = csv.DictReader(["1,2,abc,4,5,6\r\n","1,2,abc\r\n"],
fieldnames="1 2 3 4 5 6".split(),
restval="DEFAULT")
self.assertEqual(reader.next(), {"1": '1', "2": '2', "3": 'abc',
"4": '4', "5": '5', "6": '6'})
self.assertEqual(reader.next(), {"1": '1', "2": '2', "3": 'abc',
"4": 'DEFAULT', "5": 'DEFAULT',
"6": 'DEFAULT'})
def test_read_with_blanks(self):
reader = csv.DictReader(["1,2,abc,4,5,6\r\n","\r\n",
"1,2,abc,4,5,6\r\n"],
fieldnames="1 2 3 4 5 6".split())
self.assertEqual(reader.next(), {"1": '1', "2": '2', "3": 'abc',
"4": '4', "5": '5', "6": '6'})
self.assertEqual(reader.next(), {"1": '1', "2": '2', "3": 'abc',
"4": '4', "5": '5', "6": '6'})
class TestArrayWrites(unittest.TestCase):
def test_int_write(self):
import array
contents = [(20-i) for i in range(20)]
a = array.array('i', contents)
fileobj = StringIO()
writer = csv.writer(fileobj, dialect="excel")
writer.writerow(a)
expected = ",".join([str(i) for i in a])+"\r\n"
self.assertEqual(fileobj.getvalue(), expected)
def test_double_write(self):
import array
contents = [(20-i)*0.1 for i in range(20)]
a = array.array('d', contents)
fileobj = StringIO()
writer = csv.writer(fileobj, dialect="excel")
writer.writerow(a)
expected = ",".join([str(i) for i in a])+"\r\n"
self.assertEqual(fileobj.getvalue(), expected)
def test_float_write(self):
import array
contents = [(20-i)*0.1 for i in range(20)]
a = array.array('f', contents)
fileobj = StringIO()
writer = csv.writer(fileobj, dialect="excel")
writer.writerow(a)
expected = ",".join([str(i) for i in a])+"\r\n"
self.assertEqual(fileobj.getvalue(), expected)
def test_char_write(self):
import array, string
a = array.array('c', string.letters)
fileobj = StringIO()
writer = csv.writer(fileobj, dialect="excel")
writer.writerow(a)
expected = ",".join(a)+"\r\n"
self.assertEqual(fileobj.getvalue(), expected)
class TestDialectValidity(unittest.TestCase):
def test_quoting(self):
class mydialect(csv.Dialect):
delimiter = ";"
escapechar = '\\'
doublequote = False
skipinitialspace = True
lineterminator = '\r\n'
quoting = csv.QUOTE_NONE
d = mydialect()
mydialect.quoting = None
self.assertRaises(csv.Error, mydialect)
mydialect.quoting = csv.QUOTE_NONE
mydialect.escapechar = None
self.assertRaises(csv.Error, mydialect)
mydialect.doublequote = True
mydialect.quoting = csv.QUOTE_ALL
mydialect.quotechar = '"'
d = mydialect()
mydialect.quotechar = "''"
self.assertRaises(csv.Error, mydialect)
mydialect.quotechar = 4
self.assertRaises(csv.Error, mydialect)
def test_delimiter(self):
class mydialect(csv.Dialect):
delimiter = ";"
escapechar = '\\'
doublequote = False
skipinitialspace = True
lineterminator = '\r\n'
quoting = csv.QUOTE_NONE
d = mydialect()
mydialect.delimiter = ":::"
self.assertRaises(csv.Error, mydialect)
mydialect.delimiter = 4
self.assertRaises(csv.Error, mydialect)
def test_lineterminator(self):
class mydialect(csv.Dialect):
delimiter = ";"
escapechar = '\\'
doublequote = False
skipinitialspace = True
lineterminator = '\r\n'
quoting = csv.QUOTE_NONE
d = mydialect()
mydialect.lineterminator = ":::"
d = mydialect()
mydialect.lineterminator = 4
self.assertRaises(csv.Error, mydialect)
if not hasattr(sys, "gettotalrefcount"):
if verbose: print "*** skipping leakage tests ***"
else:
class NUL:
def write(s, *args):
pass
writelines = write
class TestLeaks(unittest.TestCase):
def test_create_read(self):
delta = 0
lastrc = sys.gettotalrefcount()
for i in xrange(20):
gc.collect()
self.assertEqual(gc.garbage, [])
rc = sys.gettotalrefcount()
csv.reader(["a,b,c\r\n"])
csv.reader(["a,b,c\r\n"])
csv.reader(["a,b,c\r\n"])
delta = rc-lastrc
lastrc = rc
# if csv.reader() leaks, last delta should be 3 or more
self.assertEqual(delta < 3, True)
def test_create_write(self):
delta = 0
lastrc = sys.gettotalrefcount()
s = NUL()
for i in xrange(20):
gc.collect()
self.assertEqual(gc.garbage, [])
rc = sys.gettotalrefcount()
csv.writer(s)
csv.writer(s)
csv.writer(s)
delta = rc-lastrc
lastrc = rc
# if csv.writer() leaks, last delta should be 3 or more
self.assertEqual(delta < 3, True)
def test_read(self):
delta = 0
rows = ["a,b,c\r\n"]*5
lastrc = sys.gettotalrefcount()
for i in xrange(20):
gc.collect()
self.assertEqual(gc.garbage, [])
rc = sys.gettotalrefcount()
rdr = csv.reader(rows)
for row in rdr:
pass
delta = rc-lastrc
lastrc = rc
# if reader leaks during read, delta should be 5 or more
self.assertEqual(delta < 5, True)
def test_write(self):
delta = 0
rows = [[1,2,3]]*5
s = NUL()
lastrc = sys.gettotalrefcount()
for i in xrange(20):
gc.collect()
self.assertEqual(gc.garbage, [])
rc = sys.gettotalrefcount()
writer = csv.writer(s)
for row in rows:
writer.writerow(row)
delta = rc-lastrc
lastrc = rc
# if writer leaks during write, last delta should be 5 or more
self.assertEqual(delta < 5, True)
def _testclasses():
mod = sys.modules[__name__]
return [getattr(mod, name) for name in dir(mod) if name.startswith('Test')]
def suite():
suite = unittest.TestSuite()
for testclass in _testclasses():
suite.addTest(unittest.makeSuite(testclass))
return suite
if __name__ == '__main__':
unittest.main(defaultTest='suite')