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

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One can pass language_level as an option to the cythonize-function in the setup.py-script:

ext_modules = cythonize(
               extensions, 
               compiler_directives={'language_level' : "3"}   # or "2" or "3str"
             )

Another possible syntax is

ext_modules = cythonize(extensions, language_level = "3")

The above might be more convenient than to add

#cython: language_level=3

to every pyx-file in the project, which might become necessary because since Cython 0.29 there is a warning, if the language_level isn’t set explicitly:

/Main.py:367: FutureWarning: Cython directive ‘language_level’ not
set, using 2 for now (Py2). This will change in a later release! File:
XXXXXX.pyx
tree = Parsing.p_module(s, pxd, full_module_name)

Because language_level is a global setting, the decorator

cimport cython

@cython.language_level("3")
def do_something():
    pass

will not even be cythonized.

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