New submission from R. David Murray <rdmur...@bitdance.com>:
rdmurray@hey:~/python/p32>cat bad.py
This line is just ascii
A second line for good measure.
This comment contains undecodable stuff: "�" or "\\xe9" in "pass�"" cannot
be decoded.
The last line above is in latin-1, with an é inside those quotes.
rdmurray@hey:~/python/p32>cat bug.py
import sys
with open('./bad.py', buffering=int(sys.argv[1])) as f:
for line in f:
print(line, end='')
rdmurray@hey:~/python/p32>python3 bug.py -1
Traceback (most recent call last):
File "bug.py", line 3, in <module>
for line in f:
File "/usr/lib/python3.2/codecs.py", line 300, in decode
(result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xe9 in position 99:
invalid continuation byte
rdmurray@hey:~/python/p32>python3 bug.py 1
Traceback (most recent call last):
File "bug.py", line 3, in <module>
for line in f:
File "/usr/lib/python3.2/codecs.py", line 300, in decode
(result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xe9 in position 99:
invalid continuation byte
rdmurray@hey:~/python/p32>python3 bug.py 2
This line is just ascii
A second line for good measure.
Traceback (most recent call last):
File "bug.py", line 3, in <module>
for line in f:
File "/usr/lib/python3.2/codecs.py", line 300, in decode
(result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xe9 in position 0:
invalid
continuation byte
So, line buffering does not appear to buffer line by line.
I ran into this problem because I had a much larger file that I thought
was in utf-8. When I got the encoding error, I was annoyed that the
error message didn't really tell me which line the error was on, but I
figured, OK, I'll just set line buffering and then I'll be able to tell.
But that didn't work. Fortunately using '2' did work....but at a minimum
the docs need to be updated to indicate when line buffering really is
line buffering and when it isn't.
----------
messages: 162656
nosy: pitrou, r.david.murray
priority: normal
severity: normal
stage: needs patch
status: open
title: line buffering isn't always
type: behavior
versions: Python 3.2, Python 3.3
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15049>
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