Thanks for those replies.

The popup scratchpad extension appears to be just a single cell and has to 
be launched from within a regular notebook that is already attached to a 
file, so that's not really a solution for me,

The Jupyterlab code console looks quite nice, but my experience has been 
that some things (especially related to plotting) don't yet work properly 
in Jupyterlab, or require more tweaking to get them to work.  However, I 
may take another look at Jupyterlab now that I now about the code console.

On Thursday, August 1, 2019 at 4:35:06 PM UTC-7, Afshin T. Darian wrote:
>
> Hello!
>
> You might find that the Code Console in JupyterLab serves as the 
> "scratchpad" you are looking for:
>
> https://jupyterlab.readthedocs.io/en/stable/user/code_console.html
>
> Cheers!
>
> -Darian
>
> On Thu, Aug 1, 2019 at 6:38 PM Jonathan Gutow <[email protected] 
> <javascript:>> wrote:
>
>> Have you looked at 
>> https://github.com/ipython-contrib/jupyter_contrib_nbextensions/tree/master/src/jupyter_contrib_nbextensions/nbextensions?
>>  
>> In particular the pop-up scratchpad extension might be what you are looking 
>> for.
>>
>> Regards,
>> Jonathan
>>
>> On Thursday, August 1, 2019 at 1:46:15 AM UTC-5, Brendan Barnwell wrote:
>>>
>>> One thing I really miss in the Jupyter notebook is the ability to create 
>>> a "scratch" notebook without having to worry about where the file is 
>>> located or what it's named.  Often this is for some throwaway task.  
>>> Sometimes I may want to save it, but if so, I want to save it later.  The 
>>> problem is that Jupyter requires me to create the notebook file first, and 
>>> unless I explicitly delete it it will stick around in whatever directory I 
>>> created it in, creating a clutter of one-off scratchpad notebooks.
>>>
>>> In most ordinary desktop programs (like Word or whatever), you start by 
>>> opening a document that is not connected with a file.  Later, if you want 
>>> to save it, you specify the path and name at that time.  Jupyter does this 
>>> backwards, where you have to choose the location and filename first before 
>>> beginning to edit.
>>>
>>> Is there any way to create a "floating" notebook that is not connected 
>>> to an explicitly named file?  It's fine if it's secretly connected to a 
>>> temporary file somewhere, but the point is I want to be able to hit one 
>>> button for "new unnamed notebook" and get a notebook that will silently 
>>> disappear (e.g., deleting the temp file) if I don't save it.
>>>
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