How to specify Python 3 source in Cython's setup.py?

Question

I am trying to do a "Hello World" program in Cython, following this tutorial http://docs.cython.org/src/tutorial/cython_tutorial.html#cython-hello-world

I c

Answer 1

If you are using a setup.py with Extension, as in this example

from distutils.core import setup
from distutils.extension import Extension
from Cython.Distutils import build_ext

ext_modules = [
    Extension("mymodule1",  ["mymodule1.py"]),
    Extension("mymodule2",  ["mymodule2.py"]),
]

setup(
    name = 'My Program Name',
    cmdclass = {'build_ext': build_ext},
    ext_modules = ext_modules
)

then you have to add the following snippet to apply the language_level directive (BEFORE the setup(...), thanks codeman48):

for e in ext_modules:
    e.cython_directives = {'language_level': "3"} #all are Python-3