start python interop example

examples/python-interop/.gitignore

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+/venv

examples/python-interop/main.py

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+def main():
+    pass
+
+
+if __name__ == "__main__":
+    main()

examples/python-interop/main.rs

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+fn main() {}

examples/python-interop/requirements.txt

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+cfdp-py == 0.2.0