code: def get_gid_list(user, include_default=True):
      '''
      Returns a list of all of the system group IDs of which the user
      is a member.
      '''
      if HAS_GRP is False or HAS_PWD is False:
          return []
      gid_list = list(
          six.itervalues(
              get_group_dict(user, include_default=include_default)
          )
      )
      return sorted(set(gid_list)f get_gid_list(user, include_default=True):
      '''
      Returns a list of all of the system group IDs of which the user
      is a member.
      '''
      if HAS_GRP is False or HAS_PWD is False:
          return []
      gid_list = list(
          six.itervalues(
              get_group_dict(user, include_default=include_default)
          )
      )
      return sorted(set(gid_list))
docs: Returns a list of all of the system group IDs of which the user
      is a member.