[AstroPy] matplotlib's pie colors

[Grigoris Maravelias]

Hello list!

I have a question regarding the colors of the pie diagram of matplotlib. 
When no colors are assigned then the pie function automatically selects 
some colors, like the example image I have attached. But in this case 
the black color covers the text. How can we avoid this?Is there an easy 
(perhaps?) way to exclude a color?

Of course there is not problem if I specifically select the colors but I 
do not know how many parts exist beforehand (and I would like to assign 
it automatically).

Thanks!

Regards

Grigoris
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