DCT transform (API)? (scipy or otherwise)

[Hans Georg Schaathun]

I am looking for a 2-D DCT transform function for use in python.  
Does anyone have any good pointers?

I see that one is promised in scipy 0.8.0, but I cannot find any
details on how close that is to being released.  I am not sure if
running bleeding-edge scipy would solve my problem; I should have
liked more experience with numerical programming before I tried
that, especially since I do not otherwise use the C and fortran
libraries it is based on.  Are there alternatives to scipy for this
particular feature?

TIA for any pointers
:-- George