To make a projection you must have your 3D model loaded into python, and you must be able to define your projection direction as a Transform object. See Using the EMAN2 Transform class and the Transform turorial page for more information on the Transform object. Also, for more information on Euler angles see the Sparx wiki page. 

   1 a = test_image_3d(1)
   2 proj = a.project("standard",Transform()) # this makes a projection along the z axis
   3 t = Transform({"type":"eman","alt":15}
   4 proj2 = a.project("standard",t) # now the projection is off axis
   5 display([proj,proj2])