Bugs item #1156259, was opened at 2005-03-03 23:29 Message generated for change (Comment added) made by lemburg You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1156259&group_id=5470
Category: Extension Modules Group: Python 2.4 Status: Open Resolution: None Priority: 7 Submitted By: Matthias Klose (doko) Assigned to: Martin v. Löwis (loewis) Summary: [2.4 regression] seeking in codecs.reader broken Initial Comment: [forwarded from https://bugzilla.ubuntu.com/show_bug.cgi?id=6972 ] This is a regression; the following script (call as "scriptname some_textfile") fails. It is obvious that the file starts with a number of random bytes from the previous run. Uncommenting the two #XXX lines makes the bug go away. So does running it with Python 2.3.5 import sys import codecs from random import random data = codecs.getreader("utf-8")(open(sys.argv[1])) df = data.read() for t in range(30): #XXX data.seek(0,1) #XXX data.read() data.seek(0,0) dn="" for l in data: dn += l if random() < 0.1: break if not df.startswith(dn): print "OUCH",t print "BAD:", dn[0:100] print "GOOD:", df[0:100] sys.exit(1) print "OK",len(df) sys.exit(0) ---------------------------------------------------------------------- >Comment By: M.-A. Lemburg (lemburg) Date: 2005-03-04 10:56 Message: Logged In: YES user_id=38388 This is obviously related to the buffer logic that Walter added to support .readline(). In order to fix the problem, a .seek() method must be implemented that resets the buffers whenever called (before asking the stream to seek to the specified stream position). ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1156259&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
