Re: [Matplotlib-users] refresh a matplotlib plot when reruning a script

[Eric F. <ef...@ha...>]

On 2014/06/27, 9:59 AM, zunbeltz wrote:
> I have a script that fetchs data from a database and plot using
> something similar to
>
> fig, (ax1, ax3) = plt.subplots(2, 1, sharex=False, sharey=False, num=fignum)
> ax1.errorbar(...)
> title(...)
> ax2 = ax1.twiny()
> ax4 = ax2.twiny()
> ...
> plt.legent()
> plt.draw()
>
> Then, I call this script with plt.ion() and I use plt.show(block=True);
> so the plot stays opened.
>
> Now, I want to rerun the script every second to get the updated data
> from the database. Is it posible to have the plot no blocking the script
> and being refresh?

You might find that plt.pause(1) is helpful.
See pylab_examples/animation_demo.py.

Also, it sounds like running via ipython, if possible, would make things 
easier for you; it takes care of all sorts of difficulties with 
interactivity.  And it's wonderfully helpful in other ways as well.

>
> I try to use block=False but this makes that the plot is not shown. I
> want to change my original script as little as possible. One posible
> idea I have is to pickle the plot (in the original script); and use
> another script that opens the pickled file every second.

That sounds overly complex and roundabout.  I'm sure that one or more of 
the suggestions above can lead to a simple solution.

Eric

>
> TIA
>
> Zunbeltz
> (posted unsuccessfully at stackoverflow)
>
>
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