old_contents: # -*- coding: utf-8 -*-
  # Copyright (c) 2017 Richard Hull and contributors
  # See LICENSE.rst for details.
  
  import atexit
  
  from luma.core.serial import i2c
  import luma.core.mixin as mixin
  import luma.core.const
  
  
  class device(mixin.capabilities):
      """
      Base class for display driver classes
  
      .. warning::
          Direct use of the :func:`command` and :func:`data` methods are
          discouraged: Screen updates should be effected through the
          :func:`display` method, or preferably with the
          :class:`luma.core.render.canvas` context manager.
      """
      def __init__(self, const=None, serial_interface=None):
          self._const = const or luma.core.const.common
          self._serial_interface = serial_interface or i2c()
          atexit.register(self.cleanup)
  
      def command(self, *cmd):
          """
          Sends a command or sequence of commands through to the delegated
          serial interface.
          """
          self._serial_interface.command(*cmd)
  
      def data(self, data):
          """
          Sends a data byte or sequence of data bytes through to the delegated
          serial interface.
          """
          self._serial_interface.data(data)
  
      def show(self):
          """
          Sets the display mode ON, waking the device out of a prior
          low-power sleep mode.
          """
          self.command(self._const.DISPLAYON)
  
      def hide(self):
          """
          Switches the display mode OFF, putting the device in low-power
          sleep mode.
          """
          self.command(self._const.DISPLAYOFF)
  
      def contrast(self, level):
          """
          Switches the display contrast to the desired level, in the range
          0-255. Note that setting the level to a low (or zero) value will
          not necessarily dim the display to nearly off. In other words,
          this method is **NOT** suitable for fade-in/out animation.
  
          :param level: Desired contrast level in the range of 0-255.
          :type level: int
          """
          assert(0 <= level <= 255)
          self.command(self._const.SETCONTRAST, level)
  
      def cleanup(self):
          self.hide()
          self.clear()
          self._serial_interface.cleanup()
  
new_contents: # -*- coding: utf-8 -*-
  # Copyright (c) 2017 Richard Hull and contributors
  # See LICENSE.rst for details.
  
  import atexit
  
  from luma.core.serial import i2c
  from luma.core import mixin
  import luma.core.const
  
  
  class device(mixin.capabilities):
      """
      Base class for display driver classes
  
      .. warning::
          Direct use of the :func:`command` and :func:`data` methods are
          discouraged: Screen updates should be effected through the
          :func:`display` method, or preferably with the
          :class:`luma.core.render.canvas` context manager.
      """
      def __init__(self, const=None, serial_interface=None):
          self._const = const or luma.core.const.common
          self._serial_interface = serial_interface or i2c()
          atexit.register(self.cleanup)
  
      def command(self, *cmd):
          """
          Sends a command or sequence of commands through to the delegated
          serial interface.
          """
          self._serial_interface.command(*cmd)
  
      def data(self, data):
          """
          Sends a data byte or sequence of data bytes through to the delegated
          serial interface.
          """
          self._serial_interface.data(data)
  
      def show(self):
          """
          Sets the display mode ON, waking the device out of a prior
          low-power sleep mode.
          """
          self.command(self._const.DISPLAYON)
  
      def hide(self):
          """
          Switches the display mode OFF, putting the device in low-power
          sleep mode.
          """
          self.command(self._const.DISPLAYOFF)
  
      def contrast(self, level):
          """
          Switches the display contrast to the desired level, in the range
          0-255. Note that setting the level to a low (or zero) value will
          not necessarily dim the display to nearly off. In other words,
          this method is **NOT** suitable for fade-in/out animation.
  
          :param level: Desired contrast level in the range of 0-255.
          :type level: int
          """
          assert(0 <= level <= 255)
          self.command(self._const.SETCONTRAST, level)
  
      def cleanup(self):
          self.hide()
          self.clear()
          self._serial_interface.cleanup()
  
subject: Correct import