from mapnik import Map, Layer
proj4 = '+proj=tmerc +lat_0=3.441883333 +lon_0=-76.5205625 +k=1 +x_0=1061900.18 +y_0=872364.63 +a=6379137 +b=6357748.961329674 +units=m +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)