old_contents: # __init__.py
  
  from .calibration_widget import CalibrationWidget
  from .cursor_widget import CursorWidget
  from .dac_widget import DacWidget
  from .lase_widget import LaseWidget
  from .slider_widget import SliderWidget
  from .oscillo_widget import OscilloWidget
  from .laser_widget import LaserWidget
  from .math_widget import MathWidget
  from .monitor_widget import MonitorWidget
  from .save_widget import SaveWidget
  from .select_channel_widget import SelectChannelWidget
  from .welcome_widget import WelcomeWidget
  from .spectrum_widget import SpectrumWidget
  from .stats_widget import StatsWidget
  
  __all__ = [ 'CalibrationWidget',
              'CursorWidget',
              'DacWidget',
              'LaseWidget',
              'SliderWidget',
              'OscilloWidget',
              'LaserWidget',
              'MathWidget',
              'MonitorWidget',
              'SaveWidget',
              'SelectChannelWidget',
              'WelcomeWidget',
              'SpectrumWidget',
              'StatsWidget'
              ]
  
new_contents: # __init__.py
  
  from .calibration_widget import CalibrationWidget
  from .cursor_widget import CursorWidget
  from .dac_widget import DacWidget
  from .lase_widget import LaseWidget
  from .slider_widget import SliderWidget
  from .oscillo_widget import OscilloWidget
  from .laser_widget import LaserWidget
  from .math_widget import MathWidget
  from .monitor_widget import MonitorWidget
  from .save_widget import SaveWidget
  from .select_channel_widget import SelectChannelWidget
  from .welcome_widget import WelcomeWidget
  from .spectrum_widget import SpectrumWidget
  from .stats_widget import StatsWidget
  
  __all__ = ['CalibrationWidget',
             'CursorWidget',
             'DacWidget',
             'LaseWidget',
             'SliderWidget',
             'OscilloWidget',
             'LaserWidget',
             'MathWidget',
             'MonitorWidget',
             'SaveWidget',
             'SelectChannelWidget',
             'WelcomeWidget',
             'SpectrumWidget',
             'StatsWidget'
            ]
  
subject: clean __init__.py