I don't think it's currently possible in any sort of "automatic" way. 
There have been thoughts of adding support for multiple y labels in the 
past, but that's a medium-sized chunk of work.

However, as a roundabout approach, you could add figure text:

t = gcf().text(0.5, 0.05, "Margin $",
                horizontalalignment='center', color=marginColor)

The location of the text is specified relative to the whole figure (in 
the range 0-1).  It may take some tweaking to get the positioning right.

BTW -- I don't know if you're using 0.90 or 0.91.  In 0.91, since the 
string "Sales $\nMargin $" has two dollar-signs, the section between 
them will be treated as math notation.  To avoid that, you can escape 
the dollar signs, i.e. "Sales \\$\nMargin \\$".

Cheers,
Mike

John Harrison wrote:
> Is there a way to have two colors of text on an axis label?  I am  
> trying to plot sales dollars and margin dollars on the same graph in  
> different colors.  That works well enough but I'm having a hard time  
> labeling the yaxis
> 
> plot_date(dates,units,visible = False)
> bar(dates,sales,width=5.0,color = salesColor)
> bar(dates,margin,width=5.0,color = marginColor)
> ylabel("Sales $\nMargin $",color=salesColor)
> 
> gets me "Sales $" in the proper color but I can't figure out if it is  
> possible to have "Margin $"  in its color as well.
> 
> Thanks!
> John
> 
> 
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

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