def readinto(self, buf, start=0, end=None, write_value=0):
         """Read data from SPI and into the buffer"""
         end = end if end else len(buf)
-        buffer_out = [write_value] * (end-start)
-        result = self._port.exchange(
-            buffer_out, end - start, duplex=True
-        )
+        buffer_out = [write_value] * (end - start)
+        result = self._port.exchange(buffer_out, end - start, duplex=True)
         for i, b in enumerate(result):
             buf[start + i] = b