code: def load_map(map, src_file, output_dir, scale=1, cache_dir=None, datasources_cfg=None, user_styles=[], verbose=False):
      
      scheme, n, path, p, q, f = urlparse(src_file)
      
      if scheme in ('file', ''):
          assert exists(src_file), "We'd prefer an input file that exists to one that doesn't"
      
      if cache_dir is None:
          cache_dir = expanduser(CACHE_DIR)
          
          # only make the cache dir if it wasn't user-provided
          if not isdir(cache_dir):
              mkdir(cache_dir)
              chmod(cache_dir, 0755)
  
      dirs = Directories(output_dir, realpath(cache_dir), dirname(src_file))
      compile(src_file, dirs, verbose, datasources_cfg=datasources_cfg, user_styles=user_styles, scale=scale).to_mapnik(map, dirs)
docs: Apply a stylesheet source file to a given mapnik Map instance, like mapnik.load_map().
      
          Parameters:
          
            map:
              Instance of mapnik.Map.
          
            src_file:
              Location of stylesheet .mml file. Can be relative path, absolute path,
              or fully-qualified URL of a remote stylesheet.
          
            output_dir:
              ...
          
          Keyword Parameters:
          
            scale:
              Optional scale value for output map, 2 doubles the size for high-res displays.
          
            cache_dir:
              ...
          
            datasources_cfg:
              ...
          
            user_styles:
              A optional list of files or URLs, that override styles defined in
              the map source. These are evaluated in order, with declarations from
              later styles overriding those from earlier styles.
          
            verbose:
              ...