From: Antoine Pitrou Date: Fri, 4 Feb 2011 20:17:40 +0000 (+0000) Subject: Merged revisions 88334 via svnmerge from X-Git-Tag: v3.2.1b1~347^2~28 X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=8e0ef58f30302a097230f96b4b5f2fd02e9e11c2;p=python Merged revisions 88334 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ 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. ........ --- 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`.