code: def get_default_group(user):
      '''
      Returns the specified user's default group. If the user doesn't exist, a
      KeyError will be raised.
      '''
      return grp.getgrgid(pwd.getpwnam(user).pw_gid).gr_name \
          if HAS_GRP and HAS_PWD \
          else Nonf get_default_group(user):
      '''
      Returns the specified user's default group. If the user doesn't exist, a
      KeyError will be raised.
      '''
      return grp.getgrgid(pwd.getpwnam(user).pw_gid).gr_name \
          if HAS_GRP and HAS_PWD \
          else None
docs: Returns the specified user's default group. If the user doesn't exist, a
      KeyError will be raised.