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We can also go the "blind way", using minimal mathematical effort and minimal code:

def f(x,y): 
    z = x+i*y 
    return abs(z+2)^2 > abs(z-2*i)^2 + 1 

region_plot( f, xrange=(-6, 6), yrange=(-6, 6) )

And i've got the Launched png viewer for Graphics object consisting of 1 graphics primitive window. (The function to be plotted via region_plot delivers True or False. The graphic object highlights the True region.