[Cython] python version for conditional compilation?

Hi, looking at the Cython Sphinx documentation, I don't see the Python 
version as a variable I can use for conditional compilation. This would 
be handy in the case of newly added features in the Python-C API, for 
example. Would this be feasible to add (alongside UNAME_SYSNAME and 
friends)?

(The location of the docs I was looking at: 
http://www.mudskipper.ca/cython-doc/docs/language_basics.html#compile-time-definitions 
)