YPy is a Yield-based Python application server that uses Stackless Python/the greenlets module for transparent stack switching in Python. YPy is not a web framework, but a web server like Apache with mod_python/mod_wsgi for Python or Mongrel for Ruby on Rails. YPy is primarily intended as a WSGI server, though it can be used for other (non-web) applications.

See the YPy README.txt for instructions on installing YPy. See BasicWSGIServer for instructions on how to get a basic WSGI application running under YPy.