The psycogreen package enables psycopg2 to work with coroutine libraries, using asynchronous calls internally but offering a blocking interface so that regular code can run unmodified.

Psycopg offers coroutines support since release 2.2. Because the main module is a C extension it cannot be monkey-patched to become coroutine-friendly. Instead it exposes a hook that coroutine libraries can use to install a function integrating with their event scheduler. Psycopg will call the function whenever it executes a libpq call that may block. psycogreen is a collection of "wait callbacks" useful to integrate Psycopg with different coroutine libraries.