from mapscript import mapObj,layerObj
wkt = '''GEOGCS["GCS_Sphere_EMEP",DATUM["D_Sphere_EMEP",SPHEROID["Sphere_EMEP",6371200.0,0.0]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]'''
m = mapObj('')
m.setWKTProjection(wkt)
lyr = layerObj(m)
lyr.setWKTProjection(wkt)