peter@peter-laptop:~/mapnik/mapnik-osm/mapnik$ MAPNIK_MAP_FILE="osm.xml" ./generate_image.py
Traceback (most recent call last):
  File "./generate_image.py", line 16, in <module>
    import mapnik
ImportError: No module named mapnik
peter@peter-laptop:~/mapnik/mapnik-osm/mapnik$ MAPNIK_MAP_FILE="osm.xml" ./generate_image.py
Traceback (most recent call last):
  File "./generate_image.py", line 36, in <module>
    m = mapnik.Map(imgx,imgy)
NameError: name 'mapnik' is not defined