<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _AssertValidators(self, validators):
 """Assert if all validators in the list are satisfied. Asserts validators in the order they were created. Args: validators: Iterable(validators.Validator), validators to be verified Raises: AttributeError: if validators work with a non-existing flag. IllegalFlagValueError: if validation fails for at least one validator """

    for validator in sorted(
        validators, key=lambda validator: validator.insertion_index):
      try:
        validator.verify(self)
      except exceptions.ValidationError as e:
        message = validator.print_flags_with_values(self)
        raise exceptions.IllegalFlagValueError('%s: %s' % (message, str(e)))