from mapnik import Map, Layer
proj4 = '+proj=tmerc +lat_0=0 +lon_0=57 +k=1 +x_0=10500000 +y_0=0 +ellps=krass +towgs84=23.9,-141.3,-80.9,0,-0.37,-0.85,-0.12 +units=m +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)