Fypp is a Python powered preprocessor. It can be used for any 
programming languages but its primary aim is to offer a Fortran 
preprocessor, which helps to extend Fortran with condititional 
compiling and template metaprogramming capabilities. Instead of 
introducing its own expression syntax, it uses Python expressions 
in its preprocessor directives, offering the consistency and 
versatility of Python when formulating metaprogramming tasks. 
  It puts strong emphasis on robustness and on neat integration 
into developing toolchains.