Python interface to c-treeACE SQL - We implemented a pure Python module called pyctree that interfaces with c-treeACE SQL using the DSQL (ctsqlapi) shared library (DLL on Windows) through the well-known ctypes Python module (which allows making calls into a C-based shared library from native Python code). This architecture has been chosen instead of writing an extension in C code because it makes the module immediately available for multiple Python implementations (for example, PyPy and Jython) and does not require any C compiler to install the extension.