Message139975
The following test fails with an AssertionError('a' != 'b') on the first read.
import codecs
FILENAME = 'test'
with open(FILENAME, 'wb') as f:
f.write('abcd'.encode('utf-8'))
with codecs.open(FILENAME, 'r+', encoding='utf-8') as f:
f.write("1")
pos = f.writer.tell()
assert pos == 1, "writer pos: %s != 1" % pos
pos = f.reader.tell()
assert pos == 1, "reader pos: %s != 1" % pos
pos = f.stream.tell()
assert pos == 1, "stream pos: %s != 1" % pos
# read() must call writer.flush()
char = f.read(1)
assert char == 'b', "%r != 'b'" % (char,)
# write() must rewind the raw stream
f.write('3')
tail = f.read()
assert tail == 'd', "%r != 'd'" % (tail,)
f.flush()
with open(FILENAME, 'rb') as f:
assert f.read() == b'1b3d'
I suppose that readline(), readlines() and __next__() have also issues.
See also issue #12215: similar issue with io.TextIOWrapper. |
|
Date |
User |
Action |
Args |
2011-07-07 13:12:47 | vstinner | set | recipients:
+ vstinner |
2011-07-07 13:12:47 | vstinner | set | messageid: <1310044367.3.0.915426685652.issue12513@psf.upfronthosting.co.za> |
2011-07-07 13:12:46 | vstinner | link | issue12513 messages |
2011-07-07 13:12:46 | vstinner | create | |
|