cython

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# mode: run
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PYTHON setup.py build_ext --inplace
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PYTHON main.py
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######## moda.pyx ########
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cpdef mod_name():
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    return "mod A"
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cdef class ClassA:
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    cpdef class_name(self):
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        return "Class A"
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cdef class ClassB(ClassA):
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    cpdef class_name(self):
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        return "Class B"
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######## modb.pyx ########
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import moda
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cpdef mod_name_override():
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    return "I was overridden"
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moda.mod_name = mod_name_override
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######## setup.py ########
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from setuptools import setup
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from Cython.Build import cythonize
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import Cython.Compiler.Options
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Cython.Compiler.Options.lookup_module_cpdef = True
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setup(
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        ext_modules = cythonize(["moda.pyx", "modb.pyx"],
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            compiler_directives={'language_level': 3})
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)
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######## main.py ########
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import moda, modb
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assert moda.mod_name() == "I was overridden"
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assert moda.mod_name == modb.mod_name_override
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assert moda.ClassA.class_name != moda.ClassB.class_name
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