If you want a release, check out Spring's download site for Spring Python.
If you want the latest source code type:
svn co https://src.springframework.org/svn/se-springpython-py/trunk/springpython
That will create a new springpython folder. This includes both the source code and the demo applications (PetClinic and SpringWiki).
You can browse the code at https://fisheye.springframework.org/browse/se-springpython-py.