I've written a Python program named fullOfEels to speed up the first stages of writing Python extension modules in C.
It is not a replacement for SWIG, SIP, or ctypes. It's for the case where you want to work in the opposite direction, specifying a Python API and then writing an implementation in C. (A small niche maybe, but I hope it isn't just me who sometimes works this way.)
The input is a Python module specifying what it should do but not how, with all the functions, classes, and methods being just pass. The output is a pair of .h and .c files with all the boilerplate C code required: module initialization, class type structs, C method functions and method tables.
Downloadable from https://bitbucket.org/hugh_fisher/fullofeels
All feedback and suggestions welcome.