code: def get_unit_id(unit_name):
      
      unit_name = unit_name.lower()
      attribute = 'uniqueIdentifier'
      response = LDAP_search(
          pattern_search='(cn={})'.format(unit_name),
          attribute=attribute
      )
  
      unit_id = ""
      try:
          for element in response:
              if 'dn' in element and element['dn'].startswith('ou={},'.format(unit_name)):
                  unit_id = element['attributes'][attribute][0]
      except Exception:
          raise EpflLdapException("The unit named '{}' was not found".format(unit_name))
      finally:
          if not unit_id:
              raise EpflLdapException("The unit named '{}' was not found".format(unit_name))
  
      return unit_id
docs: Return the unit id to the unit 'unit_name'