happly play ....
# linux or mac os
python setup.py build_ext --inplace
# win
python setup.py build_ext -i compiler=mingw32 -DMS_WIN64
python setup.py build_ext -i compiler=msvc
# other
import pyximport
pyximport.install()
# notebook
%load_ext Cython
%%cython
from hello import say_hello_to