Hi everybody,

Should the set_alpha method of a graphics context accept a string (instead of a 
number) as an argument? Currently, some backends (agg, ps, pdf) accept strings 
such as "0.2", whereas others (svg, cairo, Mac OS X) do not. Usually that is 
not a problem, since in almost all cases set_alpha is called with a number as 
the argument. However, the example axes_zoom_effect.py, which was recently 
added to examples/pylab_examples, has these lines:

    prop_patches["alpha"]="0.2"

which causes a call to gc.set_alpha of the form gc.set_alpha("0.2"). Backends 
that do not allow strings choke on that.

Whereas in general it may perhaps be useful to allow such strings, it adds 
complexity to the code, and I don't see a good use case for it.

--Michiel.


      

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