code: def print_big_dir(self, top_n=5):
          
          self.assert_is_dir_and_exists()
  
          size_table = sorted(
              [(p, p.dirsize) for p in self.select_dir(recursive=False)],
              key=lambda x: x[1],
              reverse=True,
          )
          for p, size in size_table[:top_n]:
              print("{:<9}    {:<9}".format(repr_data_size(size), p.abspath))
docs: Print ``top_n`` big dir in this dir.