from mapnik import Map, Layer
proj4 = '+proj=sterea +lat_0=52.2385990793 +lon_0=21.0114585301 +k=1 +x_0=0 +y_0=-0 +ellps=GRS80 +units=m +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)