Polar axis and fill() function?

I am a new user of matplotlib and am trying to create a "radar" or
"star" plot. I didn't see a convenience function in matplotlib so I am
trying to create it using polar plots.

It would seem straight forward if the fill() function could be used
with polar axes, but my attempts thus far have not worked.

Is it possible to use a polar axis and the fill function, or is there
an easier way of creating "radar/star" plots?

much thanks,