from mapnik import Map, Layer
proj4 = '+proj=tmerc +lat_0=40.5 +lon_0=-110.0833333333333 +k=0.9999375 +x_0=800000 +y_0=100000 +ellps=GRS80 +units=m +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)