1  from typing import List, NamedTuple, Optional
   2  
   3  class struct_group(NamedTuple):
   4      gr_name: str
   5      gr_passwd: Optional[str]
   6      gr_gid: int
   7      gr_mem: List[str]
   8  
   9  def getgrall() -> List[struct_group]: ...
  10  def getgrgid(gid: int) -> struct_group: ...
  11  def getgrnam(name: str) -> struct_group: ...
  12