code: def get_default(self, create=True):
          
          if self._default_network is None and create:
              log.debug("Creating default network...")
              self._default_network = self.create('default', driver='bridge')
  
          return self._default_network
docs: Get the default bridge network that containers are connected to if no
          other network options are specified.
  
          :param create:
              Whether or not to create the network if it doesn't already exist.