How to use the escpos.barcode.gs_k_barcode function in escpos

def _ean13_impl(self, data, **kwargs):
        commands = barcode.gs_k_barcode(barcode.JAN13_EAN13, data, **kwargs)
        for cmd in commands:
            self.device.write(cmd)
        time.sleep(0.25) # wait for barcode to be printed
        return self.device.read()

def _code128_impl(self, data, **kwargs):
        codeset = kwargs.get('codeset', barcode.CODE128_A)
        if not is_value_in(barcode.CODE128_CODESETS, codeset):
            raise ValueError('Unknown Code 128 code set: {!r}'.format(codeset))

        encoded_data = '{{{0}{1}'.format(codeset, data) # {<data>
        commands = barcode.gs_k_barcode(barcode.CODE128, encoded_data, **kwargs)
        for cmd in commands:
            self.device.write(cmd)

        time.sleep(0.25) # wait for barcode to be printed
        return self.device.read()
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def _ean8_impl(self, data, **kwargs):
        commands = barcode.gs_k_barcode(barcode.JAN8_EAN8, data, **kwargs)
        for cmd in commands:
            self.device.write(cmd)
        time.sleep(0.25) # wait for barcode to be printed
        return self.device.read()