code: def is_member_of(self, group_name):
          
          group_dn = 'cn=%s,cn=groups,cn=accounts,%s' % (group_name, self._base_dn)
          if str(group_dn).lower() in [str(i).lower() for i in self.member_of]:
              return True
          else:
              return False
docs: Return True if member of LDAP group, otherwise return False