code: def _is_valid_function(module_name, function):
      '''
      Determine if a function is valid for a module
      '''
      try:
          functions = __salt__['sys.list_functions'](module_name)
      except salt.exceptions.SaltException:
          functions = ["unable to look up functions"]
      return "{0}.{1}".format(module_name, function) in functionf _is_valid_function(module_name, function):
      '''
      Determine if a function is valid for a module
      '''
      try:
          functions = __salt__['sys.list_functions'](module_name)
      except salt.exceptions.SaltException:
          functions = ["unable to look up functions"]
      return "{0}.{1}".format(module_name, function) in functions
docs: Determine if a function is valid for a module