[IPython-dev] widget value persistence

Doug Blank doug.blank@gmail....
Thu Feb 27 15:24:19 CST 2014


On Thu, Feb 27, 2014 at 4:23 PM, Doug Blank <doug.blank@gmail.com> wrote:

> On Thu, Feb 27, 2014 at 4:11 PM, Darren Dale <dsdale24@gmail.com> wrote:
>
>> Do you have an example of this? I tried in one of the widget example
>> notebooks and couldn't figure out how to change the default value.
>>
>
> You can just the value of the property [1], such as:
>
> mywidget.value = 25.0
>
>
> and the widget will be set to that value.
>
>
Or give it in the constructor, as in "Item A":

mysecondwidget = widgets.RadioButtonsWidget(values=["Item A", "Item
B", "Item C"], value="Item A")



> Hope that helps!
>
> -Doug
>
> [1] -
> http://nbviewer.ipython.org/github/ipython/ipython/blob/7eac82e16e9c0c9f8e232816560963a7a07d79d1/examples/widgets/Part%201%20-%20Basics.ipynb
>
>
>>
>> On Thu, Feb 27, 2014 at 3:45 PM, Brian Granger <ellisonbg@gmail.com>wrote:
>>
>>> Yes, for now the right answer is to set the value attribute of the
>>> slider when you construct it. If you are using interact, you can
>>> change the default value for the widget by changing the keyword
>>> argument in the function def.
>>>
>>> On Thu, Feb 27, 2014 at 11:57 AM, Thomas Kluyver <takowl@gmail.com>
>>> wrote:
>>> > Hi Darren,
>>> >
>>> > On 27 February 2014 11:37, Darren Dale <dsdale24@gmail.com> wrote:
>>> >>
>>> >> However, I have a question about portions of the analysis that would
>>> >> require user interaction via a widget. Suppose I start from an ipynb
>>> >> template which includes a slider that defaults to 25. My particular
>>> dataset
>>> >> requires the slider to be set to 30. Is it possible for an ipynb
>>> widget to
>>> >> save its most recent value as the new default value for the next time
>>> the
>>> >> notebook is run? This would be a game-changer for developing user
>>> interfaces
>>> >> for scientific applications.
>>> >
>>> >
>>> > We haven't yet worked out how to save widgets, so they disappear
>>> entirely
>>> > when you reload a notebook. We'll get to that for 3.0, and I imagine
>>> then
>>> > that the latest value of a slider will be saved with the notebook.
>>> >
>>> > However, if you re-run the cell, I think it will (and should) always
>>> return
>>> > the default to what the code specifies. I think it's important that
>>> running
>>> > code has a predictable result. But I don't think this is a problem: if
>>> you
>>> > want the default to be 30, just set it to 30 in your code.
>>> >
>>> > Best wishes,
>>> > Thomas
>>> >
>>> > _______________________________________________
>>> > IPython-dev mailing list
>>> > IPython-dev@scipy.org
>>> > http://mail.scipy.org/mailman/listinfo/ipython-dev
>>> >
>>>
>>>
>>>
>>> --
>>> Brian E. Granger
>>> Cal Poly State University, San Luis Obispo
>>> bgranger@calpoly.edu and ellisonbg@gmail.com
>>> _______________________________________________
>>> IPython-dev mailing list
>>> IPython-dev@scipy.org
>>> http://mail.scipy.org/mailman/listinfo/ipython-dev
>>>
>>
>>
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