from mapnik import Map, Layer
proj4 = '+proj=lcc +lat_1=39 +lat_2=40.25 +lat_0=38.5 +lon_0=-79.5 +x_0=600000 +y_0=0 +ellps=GRS80 +units=m +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)