From 8e0ef58f30302a097230f96b4b5f2fd02e9e11c2 Mon Sep 17 00:00:00 2001 From: Antoine Pitrou Date: Fri, 4 Feb 2011 20:17:40 +0000 Subject: [PATCH] Merged revisions 88334 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit ........ r88334 | antoine.pitrou | 2011-02-04 21:11:11 +0100 (ven., 04 févr. 2011) | 3 lines Mention that seek and tell over a TextIOWrapper can be very slow. ........ --- Doc/library/io.rst | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Doc/library/io.rst b/Doc/library/io.rst index 9fb241d86f..bbe5112427 100644 --- a/Doc/library/io.rst +++ b/Doc/library/io.rst @@ -796,6 +796,8 @@ Text I/O over a binary storage (such as a file) is significantly slower than binary I/O over the same storage, because it implies conversions from unicode to binary data using a character codec. This can become noticeable if you handle huge amounts of text data (for example very large log files). +Also, :meth:`TextIOWrapper.tell` and :meth:`TextIOWrapper.seek` are both +quite slow due to the reconstruction algorithm used. :class:`StringIO`, however, is a native in-memory unicode container and will exhibit similar speed to :class:`BytesIO`. -- 2.40.0