from mapnik import Map, Layer
proj4 = '+proj=lcc +lat_1=32.5 +lat_0=32.5 +lon_0=68 +k_0=0.99878641 +x_0=2743196.4 +y_0=914398.8 +a=6377301.243 +b=6356100.230165384 +units=m +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)