old_contents: from .widget import Widget, DOMWidget, CallbackDispatcher, register
  
  from .widget_bool import Checkbox, ToggleButton
  from .widget_button import Button
  from .widget_box import Box, Popup, FlexBox, HBox, VBox
  from .widget_float import FloatText, BoundedFloatText, FloatSlider, FloatProgress, FloatRangeSlider
  from .widget_image import Image
  from .widget_int import IntText, BoundedIntText, IntSlider, IntProgress, IntRangeSlider
  from .widget_output import Output
  from .widget_selection import RadioButtons, ToggleButtons, Dropdown, Select
  from .widget_selectioncontainer import Tab, Accordion
  from .widget_string import HTML, Latex, Text, Textarea
  from .interaction import interact, interactive, fixed, interact_manual
  from .widget_link import Link, link, DirectionalLink, dlink
  
  # Deprecated classes
  from .widget_bool import CheckboxWidget, ToggleButtonWidget
  from .widget_button import ButtonWidget
  from .widget_box import ContainerWidget, PopupWidget
  from .widget_float import FloatTextWidget, BoundedFloatTextWidget, FloatSliderWidget, FloatProgressWidget
  from .widget_image import ImageWidget
  from .widget_int import IntTextWidget, BoundedIntTextWidget, IntSliderWidget, IntProgressWidget
  from .widget_selection import RadioButtonsWidget, ToggleButtonsWidget, DropdownWidget, SelectWidget
  from .widget_selectioncontainer import TabWidget, AccordionWidget
  from .widget_string import HTMLWidget, LatexWidget, TextWidget, TextareaWidget
  
  # Warn on import
  from warnings import warn
  warn("IPython widgets are experimental and may change in the future.", FutureWarning, stacklevel=2)
  
new_contents: from .widget import Widget, DOMWidget, CallbackDispatcher, register
  
  from .widget_bool import Checkbox, ToggleButton
  from .widget_button import Button
  from .widget_box import Box, Popup, FlexBox, HBox, VBox
  from .widget_float import FloatText, BoundedFloatText, FloatSlider, FloatProgress, FloatRangeSlider
  from .widget_image import Image
  from .widget_int import IntText, BoundedIntText, IntSlider, IntProgress, IntRangeSlider
  from .widget_output import Output
  from .widget_selection import RadioButtons, ToggleButtons, Dropdown, Select
  from .widget_selectioncontainer import Tab, Accordion
  from .widget_string import HTML, Latex, Text, Textarea
  from .interaction import interact, interactive, fixed, interact_manual
  from .widget_link import Link, link, DirectionalLink, dlink
  
  # Deprecated classes
  from .widget_bool import CheckboxWidget, ToggleButtonWidget
  from .widget_button import ButtonWidget
  from .widget_box import ContainerWidget, PopupWidget
  from .widget_float import FloatTextWidget, BoundedFloatTextWidget, FloatSliderWidget, FloatProgressWidget
  from .widget_image import ImageWidget
  from .widget_int import IntTextWidget, BoundedIntTextWidget, IntSliderWidget, IntProgressWidget
  from .widget_selection import RadioButtonsWidget, ToggleButtonsWidget, DropdownWidget, SelectWidget
  from .widget_selectioncontainer import TabWidget, AccordionWidget
  from .widget_string import HTMLWidget, LatexWidget, TextWidget, TextareaWidget
  
  # we use warn_explicit so we have very brief messages without file or line numbers
  # the concern is that file or line numbers will confuse the interactive user
  from warnings import warn_explicit
  __warningregistry__ = {}
  warn_explicit("IPython widgets are experimental and may change in the future.",
                FutureWarning, '', 0, registry=__warningregistry__)
  
subject: Change IPython widget warning to get rid of filenames and line numbers