Adafruit-PureIO
 RPi.GPIO; platform_machine=='armv7l' or platform_machine=='armv6l'
 rpi_ws281x>=4.0.0; platform_machine=='armv7l' or platform_machine=='armv6l'
-spidev; sys_platform == 'linux'
+spidev>=3.4.0; sys_platform == 'linux'
 sysv_ipc
 
             self._spi.max_speed_hz = self.baudrate
             self._spi.mode = self.mode
             self._spi.bits_per_word = self.bits
+            self._spi.writebytes2(buf[start:end])
+            self._spi.close()
         except FileNotFoundError as not_found:
             print("Could not open SPI device - check if SPI is enabled in kernel!")
             raise
-        try:
-            self._spi.writebytes2(buf[start:end])
-        except AttributeError as error:
-            self._spi.writebytes([x for x in buf[start:end]])
-        self._spi.close()
 
     def readinto(self, buf, start=0, end=None, write_value=0):
         if not buf: