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 Development version
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This document describes in-flight development work.


Backwards incompatible changes
------------------------------

* Python 2.6 and 3.2 are no longer supported: the minimum required
  Python versions are now 2.7 and 3.3.
* The Transformer classes have been renamed to Preprocessor in nbconvert and
  their `call` methods for them have been renamed to `preprocess`.
* The `call` methods of nbconvert post-processsors have been renamed to
  `postprocess`.