code: def get_key_flags_for_module(self, module):
      
      if not isinstance(module, str):
        module = module.__name__
  
      # Any flag is a key flag for the module that defined it.  NOTE:
      # key_flags is a fresh list: we can update it without affecting the
      # internals of this FlagValues object.
      key_flags = self._get_flags_defined_by_module(module)
  
      # Take into account flags explicitly declared as key for a module.
      for flag in self.key_flags_by_module_dict().get(module, []):
        if flag not in key_flags:
          key_flags.append(flag)
      return key_flags
docs: Returns the list of key flags for a module.
  
      Args:
        module: module|str, the module to get key flags from.
  
      Returns:
        [Flag], a new list of Flag instances.  Caller may update this list as
        desired: none of those changes will affect the internals of this
        FlagValue instance.