old_contents: from gruffy.accumulator_bar import AccumulatorBar
  from gruffy.area import Area
  from gruffy.bar import Bar
  from gruffy.bezier import Bezier
  from gruffy.dot import Dot
  from gruffy.line import Line
  from gruffy.pie import Pie
  from gruffy.sidebar import SideBar
  from gruffy.stacked_area import StackedArea
  from gruffy.stacked_bar import StackedBar
  from gruffy.stacked_sidebar import StackedSideBar
  
  __all__ = ['Accumulator', 'Area', 'Bar', 'Bezier', 'Dot', 'Line', 'Pie',
             'SideBar', 'StackedArea', 'StackedBar', 'StackedSideBar']
  
new_contents: from gruffy.accumulator_bar import AccumulatorBar
  from gruffy.area import Area
  from gruffy.bar import Bar
  from gruffy.bezier import Bezier
  from gruffy.dot import Dot
  from gruffy.line import Line
  from gruffy.pie import Pie
  from gruffy.sidebar import SideBar
  from gruffy.stacked_area import StackedArea
  from gruffy.stacked_bar import StackedBar
  from gruffy.stacked_sidebar import StackedSideBar
  
  __all__ = ['AccumulatorBar', 'Area', 'Bar', 'Bezier', 'Dot', 'Line', 'Pie',
             'SideBar', 'StackedArea', 'StackedBar', 'StackedSideBar']
  
subject: fix class name