Patches item #1677872, was opened at 2007-03-10 08:47 Message generated for change (Comment added) made by rhettinger You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=305470&aid=1677872&group_id=5470
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Library (Lib) Group: Python 3000 Status: Open Resolution: None Priority: 5 Private: No Submitted By: Mark Russell (mark_t_russell) Assigned to: Nobody/Anonymous (nobody) Summary: Efficient reverse line iterator Initial Comment: This is an implementation of __reversed__ for the TextIOWrapper type from the new IO interface (see http://docs.google.com/Doc?id=dfksfvqd_1cn5g5m). It is used as: import io for line in reversed(io.open(filename)): ... It is efficient (only reads a block at a time) but can handle arbitrary length lines. It is useful for scanning backwards through big log files, but my main reason for submitting it is as a demonstration of the usefulness of the new IO layers - it works by putting a new buffering layer round the RawIOBase object from the open() call. It's just a proof of concept, but if there's interest in this I'm happy to write unit tests and documentation. The patch also makes io.BufferedReader support buffering, and adds a very minimal implementation of io.TextIOBase and io.TextIOWrapper (needed to make io.open() work). ---------------------------------------------------------------------- >Comment By: Raymond Hettinger (rhettinger) Date: 2007-04-11 12:40 Message: Logged In: YES user_id=80475 Originator: NO FWIW, I've wanted something like this for a long time (for scanning log files in reverse). ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=305470&aid=1677872&group_id=5470 _______________________________________________ Patches mailing list Patches@python.org http://mail.python.org/mailman/listinfo/patches
