code: def _close(self):
          
          self._usb_handle.releaseInterface()
          try:
              # If we're using PyUSB >= 1.0 we can re-attach the kernel driver here.
              self._usb_handle.dev.attach_kernel_driver(0)
          except:
              pass
          self._usb_int = None
          self._usb_handle = None
          return True
docs: Release the USB interface again.