aosp12/external/python/cffi/README.md

CFFI

Foreign Function Interface for Python calling C code. Please see the Documentation or uncompiled in the doc/ subdirectory.

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Testing/development tips

To run tests under CPython, run::

pip install pytest     # if you don't have py.test already
pip install pycparser
python setup.py build_ext -f -i
py.test c/ testing/

If you run in another directory (either the tests or another program), you should use the environment variable PYTHONPATH=/path to point to the location that contains the _cffi_backend.so just compiled.