from mapscript import mapObj,layerObj
wkt = '''PROJCS["unnamed",GEOGCS["WGS 84",DATUM["unknown",SPHEROID["WGS84",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]],PROJECTION["Mollweide"],PARAMETER["central_meridian",0],PARAMETER["false_easting",0],PARAMETER["false_northing",0]]'''
m = mapObj('')
m.setWKTProjection(wkt)
lyr = layerObj(m)
lyr.setWKTProjection(wkt)