from mapnik import Map, Layer
proj4 = '+proj=tmerc +lat_0=34.75 +lon_0=-118.5833333333333 +k=0.9999 +x_0=800000.0000101599 +y_0=3999999.99998984 +ellps=GRS80 +datum=NAD83 +to_meter=0.3048006096012192 +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)