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From: Serhiy Storchaka <storchaka@gmail.com>
Subject: Re: Surprising difference between StringIO.StringIO and io.StringIO
Date: Fri, 31 May 2013 12:39:41 +0300
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Xref: csiph.com comp.lang.python:46586

30.05.13 23:46, Skip Montanaro написав(ла):
> Am I missing something about how io.StringIO works?  I thought it was
> a more-or-less drop-in replacement for StringIO.StringIO.

io.StringIO was backported from Python 3. It is a text (unicode) stream. 
cStringIO.StringIO is a binary stream and StringIO.StringIO can be used 
as binary or unicode stream depending on arguments. Use io.BaseIO as a 
replacement for StringIO.StringIO/cStringIO.StringIO if you need a 
binary stream.