Cython as a run requirement?

[jakirkham]

Appears Cython is required at runtime. Out of curiosity, what is Cython being used for at run time?

[tburmeister]

Cython is not required to use compiled pyrobuf modules, however, when you run pyrobuf --install /path/to/proto/specs pyrobuf generates Cython code for the messages your are compiling, which Cython then compiles to a Python module.