code: def _is_intrinsic_dict(self, input):
          
          # All intrinsic functions are dictionaries with just one key
          return isinstance(input, dict) \
              and len(input) == 1 \
              and list(input.keys())[0] in self.supported_intrinsics
docs: Can the input represent an intrinsic function in it?
  
          :param input: Object to be checked
          :return: True, if the input contains a supported intrinsic function.  False otherwise