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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