code: def register_connection(self, alias, api_key, base_url, timeout=5):
          
          if not base_url.endswith('/'):
              base_url += '/'
  
          self._connections[alias] = Connection(api_key, base_url, timeout)
docs: Create and register a new connection.
  
          :param alias:   The alias of the connection. If not changed with `switch_connection`,
                          the connection with default 'alias' is used by the resources.
          :param api_key: The private api key.
          :param base_url: The api url including protocol, host, port (optional) and location.
          :param timeout: The time in seconds to wait for 'connect' and 'read' respectively.
                          Use a tuple to set these values separately or None to wait forever.
          :return: