Python powered Fortran preprocessor

 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.