PYTHON setup.py build_ext --inplace

######## setup.py ###########

from distutils.core import setup
from Cython.Build import cythonize

import Cython.Compiler.Scanning

Cython.Compiler.Scanning.trace_scanner = 1

setup(
    ext_modules = cythonize("*.pyx")
)

import simple
assert simple.test() == 123


######## simple.pyx ###########

def test():
    return 123