How can I read the color of autoshape in python-pptx?

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enter image description here

Colorful circles are the autoshape type in python-pptx, Now I want to read the color(RGB or whatever) of them

What I got in documentation is use

shape.fill.solid() 
shape.fill.fore_color.rgb

But It pops

AttributeError: no .rgb property on color type '_NoneColor'

Any idea to access the color of autoshape?

(BTW, Best to post the color change method cause I read color for change it by HSV adjustment)



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