from mapnik import Map, Layer
proj4 = '+proj=tmerc +lat_0=40.5 +lon_0=-107.3333333333333 +k=0.9999375 +x_0=399999.99998984 +y_0=99999.99998983997 +ellps=GRS80 +datum=NAD83 +to_meter=0.3048006096012192 +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)