from mapnik import Map, Layer
proj4 = '+proj=tmerc +lat_0=3.44959194444444 +lon_0=-76.54705222222222 +k=1 +x_0=110000 +y_0=110000 +a=6379388 +b=6357908.579124579 +units=m +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)