Solved - just discovered methods ion() and ioff() which do the job.

JonBL wrote:
> 
> I have a Python program which calls matplotlib's show() method to display
> a plot, but control does not return to my program until I close the
> displayed figure. I want control to immediately return to my program so
> that I can display additional figures as well.
> 
> The doco (matplotlib 1.1.1) for the show() method mentions an experimental
> key word arg named 'block', that can be set to True or False. This looks
> promising, but plt.show(block = False) raises type error "got an
> unexpected keyword argument 'block'". A call to plt.show() works fine. The
> method appears to accept no arguments.
> 
> Can anyone suggest how to bypass the blocking behaviour of the show()
> method?
> 
> TIA,
>   Jon
> 

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