Scatter plot, filled markers


I want to produce a scatter plot with markers that are not filled (empty
markers). I note the following response to an earlier query regarding line2D

    > Howdy, Another stupid problem. Before .61 when I plotted
    > with symbols, the symbols were unfilled, now they are
    > filled. How do I control this? I can"t find any
    > markerfilled property in the Line2D class.

You can override the markerfacecolor as a kwarg

   >>> plot(arange(10), "ro", markerfacecolor=None)

You can also use the abbreviation "mfc"

   >>> plot(arange(10), "ro", mfc=None)

When I attempt this with scatter I get an error, reflecting the fact (after
minor digging) that RegularPolyCollection doesn't have a set_markerfacecolor

Any suggestions on how to solve this much appreciated.