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| author | Antoine Pitrou <solipsis@pitrou.net> | 2011-02-04 20:11:11 (GMT) |
|---|---|---|
| committer | Antoine Pitrou <solipsis@pitrou.net> | 2011-02-04 20:11:11 (GMT) |
| commit | eefb97cb579f8822868ce98ace820da5788e9ff7 (patch) | |
| tree | 3072ef5176e416073614b1fce07912574100994a /Doc/library/io.rst | |
| parent | d77520a426769a2d255433750822040830554658 (diff) | |
| download | cpython-eefb97cb579f8822868ce98ace820da5788e9ff7.zip cpython-eefb97cb579f8822868ce98ace820da5788e9ff7.tar.gz cpython-eefb97cb579f8822868ce98ace820da5788e9ff7.tar.bz2 | |
Mention that seek and tell over a TextIOWrapper can be very slow.
Diffstat (limited to 'Doc/library/io.rst')
| -rw-r--r-- | Doc/library/io.rst | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Doc/library/io.rst b/Doc/library/io.rst index a97fae0..26ddd8f 100644 --- a/Doc/library/io.rst +++ b/Doc/library/io.rst @@ -814,6 +814,8 @@ 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`. |