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Issue #12591: Allow io.TextIOWrapper to work with raw IO objects (without

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a read1() method), and add a *write_through* parameter to
mandate unbuffered writes.
This commit is contained in:
Antoine Pitrou 2011-07-23 21:50:21 +02:00
commit d42c1d09e9
4 changed files with 45 additions and 8 deletions
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21
Lib/test/test_io.py
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@ -2314,6 +2314,27 @@ class TextIOWrapperTest(unittest.TestCase):
with self.assertRaises(AttributeError):
txt.buffer = buf
def test_rawio(self):
# Issue #12591: TextIOWrapper must work with raw I/O objects, so
# that subprocess.Popen() can have the required unbuffered
# semantics with universal_newlines=True.
raw = self.MockRawIO([b'abc', b'def', b'ghi\njkl\nopq\n'])
txt = self.TextIOWrapper(raw, encoding='ascii', newline='\n')
# Reads
self.assertEqual(txt.read(4), 'abcd')
self.assertEqual(txt.readline(), 'efghi\n')
self.assertEqual(list(txt), ['jkl\n', 'opq\n'])
def test_rawio_write_through(self):
# Issue #12591: with write_through=True, writes don't need a flush
raw = self.MockRawIO([b'abc', b'def', b'ghi\njkl\nopq\n'])
txt = self.TextIOWrapper(raw, encoding='ascii', newline='\n',
write_through=True)
txt.write('1')
txt.write('23\n4')
txt.write('5')
self.assertEqual(b''.join(raw._write_stack), b'123\n45')
class CTextIOWrapperTest(TextIOWrapperTest):
def test_initialization(self):