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Fix the rest of issue 1400, by introducing a proper implementation of

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line buffering.  The TextIOWrapper class no longer calls isatty() on
every write() call.
This commit is contained in:
Guido van Rossum 2007-12-06 01:04:26 +00:00
parent 786720876c
commit f64db9f6db
4 changed files with 57 additions and 36 deletions
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17
Lib/test/test_io.py
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@ -496,6 +496,17 @@ class TextIOWrapperTest(unittest.TestCase):
def tearDown(self):
test_support.unlink(test_support.TESTFN)
def testLineBuffering(self):
r = io.BytesIO()
b = io.BufferedWriter(r, 1000)
t = io.TextIOWrapper(b, newline="\n", line_buffering=True)
t.write("X")
self.assertEquals(r.getvalue(), b"") # No flush happened
t.write("Y\nZ")
self.assertEquals(r.getvalue(), b"XY\nZ") # All got flushed
t.write("A\rB")
self.assertEquals(r.getvalue(), b"XY\nZA\rB")
def testEncodingErrorsReading(self):
# (1) default
b = io.BytesIO(b"abc\n\xff\n")
@ -525,13 +536,15 @@ class TextIOWrapperTest(unittest.TestCase):
self.assertRaises(UnicodeError, t.write, "\xff")
# (3) ignore
b = io.BytesIO()
t = io.TextIOWrapper(b, encoding="ascii", errors="ignore", newline="\n")
t = io.TextIOWrapper(b, encoding="ascii", errors="ignore",
newline="\n")
t.write("abc\xffdef\n")
t.flush()
self.assertEquals(b.getvalue(), b"abcdef\n")
# (4) replace
b = io.BytesIO()
t = io.TextIOWrapper(b, encoding="ascii", errors="replace", newline="\n")
t = io.TextIOWrapper(b, encoding="ascii", errors="replace",
newline="\n")
t.write("abc\xffdef\n")
t.flush()
self.assertEquals(b.getvalue(), b"abc?def\n")