from mapnik import Map, Layer
proj4 = '+proj=tmerc +lat_0=31.5 +lon_0=-110.75 +k=1.000155 +x_0=152400.3048006096 +y_0=0 +ellps=GRS80 +towgs84=0.0,0.0,0.0,0.0,0.0,0.0,0.0 +to_meter=0.3048006096012192 +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)