This is an enhancement, so I am changing the affected version from 3.3 to 3.5.  

It is python-only, which works well with the cheeseshop.

That said, the patch is truly short; if that is really sufficient, it could almost go into the documentation as a recipe.  But I would prefer some more assurances that it actually does work; a quick skim suggests that it relies on a superclass happening to implement read via readinto.

Needs tests and documentation change.