from mapnik import Map, Layer
proj4 = '+proj=tmerc +lat_0=0 +lon_0=90 +k=1 +x_0=107543.3 +y_0=-5540944.5 +ellps=krass +towgs84=23.57,-140.95,-79.8,0,0.35,0.79,-0.22 +units=m +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)