code: def function_exclusion_filter_builder(func: Strings) -> NodePredicate:
      
      if isinstance(func, str):
          def function_exclusion_filter(_: BELGraph, node: BaseEntity) -> bool:
              """Pass only for a node that doesn't have the enclosed function.
  
              :return: If the node doesn't have the enclosed function
              """
              return node[FUNCTION] != func
  
          return function_exclusion_filter
  
      elif isinstance(func, Iterable):
          functions = set(func)
  
          def functions_exclusion_filter(_: BELGraph, node: BaseEntity) -> bool:
              """Pass only for a node that doesn't have the enclosed functions.
  
              :return: If the node doesn't have the enclosed functions
              """
              return node[FUNCTION] not in functions
  
          return functions_exclusion_filter
  
      raise ValueError('Invalid type for argument: {}'.format(func))
docs: Build a filter that fails on nodes of the given function(s).
  
      :param func: A BEL Function or list/set/tuple of BEL functions