code: def new_key(self, key_name=None, key_type=Key.KEY_REGULAR_FILE):
          
          if key_name == '-':
              return Key(self.name, '-', key_type=Key.KEY_STREAM_WRITABLE)
          else:
              dir_name = os.path.dirname(key_name)
              if dir_name and not os.path.exists(dir_name):
                  os.makedirs(dir_name)
              fp = open(key_name, 'wb')
              return Key(self.name, key_name, fp)
docs: Creates a new key
  
          :type key_name: string
          :param key_name: The name of the key to create
  
          :rtype: :class:`boto.file.key.Key`
          :returns: An instance of the newly created key object