try:
    from cffi import FFI
except ImportError:
    print "pip install cffi, included with PyPy"

ffi = FFI()
lib = ffi.dlopen("./libtreble.dylib")

print lib
# <cffi.api.FFILibrary_./libtreble.dylib object at 0x107f440d0>

ffi.cdef('int treble(int);')

print "math from rust!", lib.treble(10)