from mapscript import mapObj,layerObj
wkt = '''GEOGCS["NAD27 Michigan",DATUM["NAD_Michigan",SPHEROID["Clarke 1866 Michigan",6378450.047548896,294.9786971646747,AUTHORITY["EPSG","7009"]],AUTHORITY["EPSG","6268"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4268"]]'''
m = mapObj('')
m.setWKTProjection(wkt)
lyr = layerObj(m)
lyr.setWKTProjection(wkt)