R. David Murray added the comment:

Antoine already answered that question: it does not make sense to have a single 
stream that is open for *update* if it is not seekable.  The fact C conflates 
"update" with "both read and write" can be seen as a design bug in C :)
 
The remaining question might be: is there a sensible way (that fits with the 
design of the IO system) to hook BufferedRWPair up to open?

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<http://bugs.python.org/issue20074>
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