[Python-checkins] r88334 - python/branches/py3k/Doc/library/io.rst

[antoine.pitrou]

Author: antoine.pitrou
Date: Fri Feb  4 21:11:11 2011
New Revision: 88334

Log:
Mention that seek and tell over a TextIOWrapper can be very slow.



Modified:
   python/branches/py3k/Doc/library/io.rst

Modified: python/branches/py3k/Doc/library/io.rst
==============================================================================
--- python/branches/py3k/Doc/library/io.rst	(original)
+++ python/branches/py3k/Doc/library/io.rst	Fri Feb  4 21:11:11 2011
@@ -814,6 +814,8 @@
 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`.