code: def is_instance_factory(_type):
      
      if isinstance(_type, (tuple, list)):
          _type = tuple(_type)
          type_repr = "|".join(map(str, _type))
      else:
          type_repr = "'%s'" % _type
  
      def inner(x):
          if not isinstance(x, _type):
              raise ValueError("Value must be an instance of %s" % type_repr)
  
      return inner
docs: Parameters
      ----------
      `_type` - the type to be checked against
      Returns
      -------
      validator - a function of a single argument x , which returns the
                  True if x is an instance of `_type`