cython

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PYTHON setup.py build_ext --inplace
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PYTHON test_error_pos.py
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######## setup.py ###########
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from distutils.core import setup
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from Cython.Build import cythonize
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setup(ext_modules=cythonize("error_pos.pyx"))
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######## error_pos.pyx ###########
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from os import *
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abcdefg(line)
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######## test_error_pos.py ###########
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import subprocess
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import sys
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cmd = [sys.executable, '-c', 'import error_pos']
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proc = subprocess.Popen(cmd, stderr=subprocess.PIPE)
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_, err = proc.communicate()
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# The error should contain the line number and the line text where the
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# undefined identifier is used.
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assert b'line 3, in init error_pos' in err and b'abcdefg(line)' in err, err
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