cython

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PYTHON setup.py build_ext --inplace
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PYTHON -c "import foo"
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PYTHON -c "import a; a.test()"
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######## setup.py ########
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from Cython.Build import cythonize
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from distutils.core import setup
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setup(
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  ext_modules = cythonize("*.pyx"),
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)
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######## foo.pxd ########
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cdef int bar(int i) except *
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cdef int (*var_opt)(int) except? -1
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cdef int (*var_orig)(int) except *
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######## foo.pyx ########
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cdef int bar(int i) except *:
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    if i == 10:
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        raise ValueError()
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    return i + 1
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var_opt = bar   # by 'accident' of optimisation
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var_orig = bar  # by declaration
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######## a.pyx ########
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cimport cython
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from foo cimport bar, var_orig, var_opt
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def test():
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    assert bar(-2) == -1
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    try:
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        bar(10)
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    except ValueError:
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        pass
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    else:
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        assert False, "exception not raised in bar()"
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    assert var_orig(-2) == -1
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    try:
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        var_orig(10)
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    except ValueError:
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        pass
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    else:
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        assert False, "exception not raised in var_orig()"
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    assert var_opt(-2) == -1
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    try:
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        var_opt(10)
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    except ValueError:
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        pass
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    else:
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        assert False, "exception not raised in var_opt()"
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