[IPython-dev] clear_output() of only last line?

Michael Droettboom mdroe at stsci.edu
Wed Apr 25 11:11:18 EDT 2012

That's helpful.  What I'm hoping to get to work in progress bars 
interspersed without other logging all in the same output chunk -- and 
with an API that makes sense and works either inside IPython notebook or 
out.  The ability to send down custom HTML and Javascript (which I 
didn't know about) may bear some fruit... will have experiment and think 
on that.


On 04/23/2012 12:06 AM, Fernando Perez wrote:
> Hi Mike,
> On Wed, Apr 11, 2012 at 9:43 AM, Michael Droettboom<mdroe at stsci.edu>  wrote:
>> I'm working on getting our animated progressbars in astropy to work in the
>> IPython notebook.  I found the recipe of using "clear_output()" in this bug
>> report:
>> https://github.com/ipython/ipython/issues/1527
>> That gets things closer, but unlike "\r" at a standard terminal,
>> clear_output() clears the entire output chunk, not just the last line.  So
>> if we have multiple progress bars, or progress bars interspersed with
>> logging messages, all but the last progress bar gets deleted.
>> For example:
>> from IPython.core.display import clear_output
>> print "Working"
>> for i in range(80):
>>      clear_output()
>>      print "\r" + ("=" * i)
>> Any suggestions?
> Have you had a chance to look at the new Animations_and_Progress
> notebook in master?  It shows examples of how to make both text-based
> and graphical progressbars in the nb.
> I hope that helps, and sorry for the delayed reply!
> Best,
> f
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