Serhiy Storchaka added the comment:

This primitive doesn't not well fit a case of compressed streams. A chunk of 
compressed data read from underlied file object can be uncompressed to 
unpredictable large data. We can't limit the size of buffer.

Another point is that buffer interface is not very appropriate for Python 
implementation. And we want left as much Python code in gzip, bz2, lzma and 
zipfile as possible. Copying from bytes into buffer and back will just waste 
resources.

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<http://bugs.python.org/issue19051>
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