Example of how *not* to generate a Python wrapper library from a C library using CMake. Instead, CMake should only be used to build and install the C library, and distutils should be used for the Python wrapper library.

CMakeLists.txt

find_package(PythonLibs)
if(PYTHONLIBS_FOUND)
    include_directories(${PYTHON_INCLUDE_PATH})
    find_package(SWIG REQUIRED)
    if(SWIG_FOUND)
        include(${SWIG_USE_FILE})
        #set(CMAKE_SWIG_FLAGS "")
        #set_source_files_properties(my_swig_file.i
        #    PROPERTIES SWIG_FLAGS "")
        #
        # Define swig module with given name and specified language.
        #   SWIG_ADD_MODULE(name language [ files ])
        #
        SWIG_ADD_MODULE(MyPythonModule python
            my_swig_file.i)
        #
        # Link libraries to swig module
        #   SWIG_LINK_LIBRARIES(name [ libraries ])
        #
        SWIG_LINK_LIBRARIES(MyPythonModule
            ${PYTHON_LIBRARIES}
            my_c_library)
        #
        # This will probably install the Python library to the wrong place.
        #
        install(FILES
            ${PROJECT_BINARY_DIR}/python/MyPythonModule.py
            ${PROJECT_BINARY_DIR}/python/_MyPythonModule.so
            DESTINATION lib/python2.7/site-packages)
    else(SWIG_FOUND)
        message("could not find swig; skipping swig library wrapper")
    endif(SWIG_FOUND)
else(PYTHONLIBS_FOUND)
    message("could not find python libraries; skipping swig library wrapper")
endif(PYTHONLIBS_FOUND)