code: def barcode(self, code, bc, width=255, height=2, pos='below', font='a'):
          
          # Align Bar Code()
          self._raw(TXT_ALIGN_CT)
          # Height
          if height >=2 or height <=6:
              self._raw(BARCODE_HEIGHT)
          else:
              raise BarcodeSizeError()
          # Width
          if width >= 1 or width <=255:
              self._raw(BARCODE_WIDTH)
          else:
              raise BarcodeSizeError()
          # Font
          if font.upper() == "B":
              self._raw(BARCODE_FONT_B)
          else: # DEFAULT FONT: A
              self._raw(BARCODE_FONT_A)
          # Position
          if pos.upper() == "OFF":
              self._raw(BARCODE_TXT_OFF)
          elif pos.upper() == "BOTH":
              self._raw(BARCODE_TXT_BTH)
          elif pos.upper() == "ABOVE":
              self._raw(BARCODE_TXT_ABV)
          else:  # DEFAULT POSITION: BELOW 
              self._raw(BARCODE_TXT_BLW)
          # Type 
          if bc.upper() == "UPC-A":
              self._raw(BARCODE_UPC_A)
          elif bc.upper() == "UPC-E":
              self._raw(BARCODE_UPC_E)
          elif bc.upper() == "EAN13":
              self._raw(BARCODE_EAN13)
          elif bc.upper() == "EAN8":
              self._raw(BARCODE_EAN8)
          elif bc.upper() == "CODE39":
              self._raw(BARCODE_CODE39)
          elif bc.upper() == "ITF":
              self._raw(BARCODE_ITF)
          elif bc.upper() == "NW7":
              self._raw(BARCODE_NW7)
          else:
              raise BarcodeTypeError()
          # Print Code
          if code:
              self._raw(code)
          else:
              raise exception.BarcodeCodeError()
docs: Print Barcode