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import panel as pn


The FloatInput widget allows selecting a floating point value using a spinbox. It behaves like a slider except that lower and upper bounds are optional and a specific value can be entered. Value can be changed using keyboard (up, down, page up, page down), mouse wheel and arrow buttons.

Discover more on using widgets to add interactivity to your applications in the how-to guides on interactivity. Alternatively, learn how to set up callbacks and (JS-)links between parameters or how to use them as part of declarative UIs with Param.


For details on other options for customizing the component see the layout and styling how-to guides.


  • value (float | None): The current value. Updates on <enter>, when the widget looses focus, or arrow icons or keyboard up arrow, down arrow, PgUp, or PgDown keys pressed. Can return None if all digits are deleted.

  • value_throttled (float | None): Behaves identically to value for this widget, except is read only.

  • step (float): The step added or subtracted to the current value on each click

  • start (float): Optional minimum allowable value

  • end (float): Optional maximum allowable value

  • format (str): Optional format to convert the float value in string, see : http://numbrojs.com/old-format.html

  • page_step_multiplier (int): Defines the multiplication factor applied to step when the page up and page down keys are pressed.


  • disabled (boolean): Whether the widget is editable

  • name (str): The title of the widget

  • placeholder (str): A placeholder string displayed when no value is entered

float_input = pn.widgets.FloatInput(name='FloatInput', value=5., step=1e-1, start=0, end=1000)


FloatInput.value returns a float value:



The FloatSpinner widget exposes a number of options which can be changed from both Python and Javascript. Try out the effect of these parameters interactively:

pn.Row(float_input.controls(jslink=True), float_input)

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