common.py

class CommonIso:
    def get_label(self):
        return (self.is_echo_request() and 'Echo Request') or \
                (self.is_echo_response() and 'Echo Response') or \
                (self.is_sign_on_request() or \
                self.is_sign_on_response() or \
                self.is_sign_off_request() or \
                self.is_sign_off_response() or \
                self.is_inquiry_request() or \
                self.is_inquiry_response() or \
                self.is_payment_request() or \
                self.is_payment_response() or \
                self.is_reversal_request() or \
                self.is_reversal_response()