from mapnik import Map, Layer
proj4 = '+proj=tmerc +lat_0=29.5 +lon_0=-88.83333333333333 +k=0.99995 +x_0=300000.0000000001 +y_0=0 +ellps=GRS80 +datum=NAD83 +to_meter=0.3048006096012192 +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)