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[3.12] gh-80109: Fix io.TextIOWrapper dropping the internal buffer during write() (GH-22535) (GH-113808)

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io.TextIOWrapper was dropping the internal decoding buffer
during read() and write() calls.
(cherry picked from commit 73c9326563)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
This commit is contained in:
Miss Islington (bot) 2024-01-08 12:00:30 +01:00 • committed by GitHub
parent db6f297d44
commit ad2d5ec97e
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4 changed files with 24 additions and 8 deletions
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8
Lib/test/test_io.py
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@ -3891,6 +3891,14 @@ class TextIOWrapperTest(unittest.TestCase):
t.write('x')
t.tell()
def test_issue35928(self):
p = self.BufferedRWPair(self.BytesIO(b'foo\nbar\n'), self.BytesIO())
f = self.TextIOWrapper(p)
res = f.readline()
self.assertEqual(res, 'foo\n')
f.write(res)
self.assertEqual(res + f.readline(), 'foo\nbar\n')
class MemviewBytesIO(io.BytesIO):
'''A BytesIO object whose read method returns memoryviews