Bugs item #1102649, was opened at 2005-01-14 16:58 Message generated for change (Comment added) made by tim_one You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1102649&group_id=5470
Category: Documentation Group: Python 2.4 Status: Open Resolution: None Priority: 5 Submitted By: John Machin (sjmachin) Assigned to: Nobody/Anonymous (nobody) Summary: pickle files should be opened in binary mode Initial Comment: pickle (and cPickle): At _each_ mention of the pickle file, the docs should say that it should be opened with 'wb' or 'rb' mode as appropriate, so that a pickle written on one OS can be read reliably on another. The example code at the end of the section should be updated to use the 'b' flag. ---------------------------------------------------------------------- >Comment By: Tim Peters (tim_one) Date: 2005-01-19 08:45 Message: Logged In: YES user_id=31435 Yes, binary mode should always be used, regardless of protocol. Else pickles aren't portable across boxes (in particular, Unix can't read a protocol 0 pickle produced on Windows if the latter was written to a text-mode file). "text mode" was a horrible name for protocol 0. ---------------------------------------------------------------------- Comment By: Fred L. Drake, Jr. (fdrake) Date: 2005-01-19 00:09 Message: Logged In: YES user_id=3066 In response to irmin's comment: freopen() is only an option for real file objects; pickles are often stored or read from other sources. These other sources are usually binary to begin with, fortunately, though this issue probably deserves some real coverage in the documentation either way. ---------------------------------------------------------------------- Comment By: Fred L. Drake, Jr. (fdrake) Date: 2005-01-19 00:06 Message: Logged In: YES user_id=3066 Is this true in all cases? Shouldn't files containing text pickles (protocol 0) be opened in text mode? (A problem, given that all protocols should be readable without prior knowledge of the protocol used to write the pickle.) ---------------------------------------------------------------------- Comment By: Irmen de Jong (irmen) Date: 2005-01-16 10:07 Message: Logged In: YES user_id=129426 Can't the pickle code just freopen() the file itself, using binary mode? Or is this against Python's rule "explicit is better than implicit" ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1102649&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
