old_contents: """
  Widget functions to generate widgets faster.
  """
  
  from __future__ import absolute_import
  
  from .animation_widget import animation_widget
  from .category_widget import category_widget
  from .default_widget import default_widget
  from .formula_widget import formula_widget
  from .histogram_widget import histogram_widget
  from .time_series_widget import time_series_widget
  
  
  def _inspect(widget):
      import inspect
      lines = inspect.getsource(widget)
      print(lines)
  
  
  __all__ = [
    'animation_widget',
    'category_widget',
    'default_widget',
    'formula_widget',
    'histogram_widget',
    'time_series_widget',
  ]
  
new_contents: """
  Widget functions to generate widgets faster.
  """
  
  from __future__ import absolute_import
  
  from .animation_widget import animation_widget
  from .category_widget import category_widget
  from .default_widget import default_widget
  from .formula_widget import formula_widget
  from .histogram_widget import histogram_widget
  from .time_series_widget import time_series_widget
  from ..widget import Widget
  from ..widget_list import WidgetList
  
  
  def _inspect(widget):
      import inspect
      lines = inspect.getsource(widget)
      print(lines)
  
  
  __all__ = [
    'Widget',
    'WidgetList',
    'animation_widget',
    'category_widget',
    'default_widget',
    'formula_widget',
    'histogram_widget',
    'time_series_widget',
  ]
  
subject: Add Widget and WidgetList to namespace