from mapnik import Map, Layer
proj4 = '+proj=tmerc +lat_0=43.5 +lon_0=-69.125 +k=0.99998 +x_0=500000 +y_0=0 +ellps=GRS80 +units=m +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)