from mapnik import Map, Layer
proj4 = '+proj=tmerc +lat_0=0 +lon_0=-115 +k=0.9992 +x_0=500000 +y_0=-5000000 +ellps=GRS80 +datum=NAD83 +units=m +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)