code: def build(self, route_name, **args):
          ''' Builds an URL out of a named route and some parameters.'''
          try:
              return self.named[route_name] % args
          except KeyError:
              raise RouteBuildError("No route found with name '%s'." % route_namef build(self, route_name, **args):
          ''' Builds an URL out of a named route and some parameters.'''
          try:
              return self.named[route_name] % args
          except KeyError:
              raise RouteBuildError("No route found with name '%s'." % route_name)
docs: Builds an URL out of a named route and some parameters.