Re: [Matplotlib-users] trouble with Arrow

[Eric F. <ef...@ha...>]

On 2014/02/02 6:52 PM, Alan G Isaac wrote:
> Also, despite setting `edgecolor=None`, the edge is still stroked.

I suspect you need edgecolor='none'.  In general, specifying a color as 
the string 'none' means "don't draw it".