Feature Requests item #1152248, was opened at 2005-02-26 01:24 Message generated for change (Comment added) made by montanaro You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=355470&aid=1152248&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: Python Interpreter Core Group: None Status: Open Resolution: None Priority: 5 Submitted By: Nick Coghlan (ncoghlan) Assigned to: Nobody/Anonymous (nobody) Summary: Enhance file.readlines by making line separator selectable Initial Comment: There is no canonical way to iterate through a file on chunks *other* than whole lines without reading the whole file into memory. Allowing the separator to be specified as an argument to file.readlines and file.xreadlines would greatly simplify the task. See here for an example interface of the useful options: http://mail.python.org/pipermail/python-list/2005-February/268482.html ---------------------------------------------------------------------- >Comment By: Skip Montanaro (montanaro) Date: 2005-06-27 06:22 Message: Logged In: YES user_id=44345 Seems the most likely place you'd want to use this is to select a non- native line ending in a situation where you didn't want to use universal newlines (select \r as a line ending on Unix, for example, and allow \n to just be another character). In that case they'd clearly still be lines, so embellishing the normal line reading machinery without adding a new method would be most appropriate. ---------------------------------------------------------------------- Comment By: Nick Coghlan (ncoghlan) Date: 2005-06-27 04:29 Message: Logged In: YES user_id=1038590 As Douglas Alan's sample implementation (and his second attempt [1]) show, getting this right (and reasonably efficient) is actually a non-trivial exercise. Leveraging the existing readlines infrastructure is an idea worth considering. [1] http://mail.python.org/pipermail/python-list/2005-February/268547.html ---------------------------------------------------------------------- Comment By: Raymond Hettinger (rhettinger) Date: 2005-06-26 23:25 Message: Logged In: YES user_id=80475 The OPs request is not a non-starter. There is a proven precedent in AWK which allows programmer specifiable record separators. ---------------------------------------------------------------------- Comment By: Douglas Alan (nessus42) Date: 2005-02-28 12:57 Message: Logged In: YES user_id=401880 In reply to birkenfeld, I'm not sure why you don't want to call lines separated with an alternate line-separation string "lines", but if you want to call them something else, I should think they should be called "records" rather than "chunks". |>oug ---------------------------------------------------------------------- Comment By: Reinhold Birkenfeld (birkenfeld) Date: 2005-02-26 01:38 Message: Logged In: YES user_id=1188172 I don't know whether (x)readlines is the right place, since you are _not_ operating on lines. What about (x)readchunks? ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=355470&aid=1152248&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
