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

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Antoine Pitrou 2011-02-04 20:11:11 +00:00
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Doc/library/io.rst
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@ -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`.