I've been thinking a bit about rcParams and validation. It looks like values
are currently only validated when matplolibrc is read, during the call to
rc_params. What if we define a new class (RcParams), derived from dict, which
has as an attribute, a dict, called validate. We could override __setitem__
such that
rcParams['font.size'] = 12
validates the value 12 by first calling validate_float, which is referenced in
the validate attribute:
def __setitem__(self, i='font.size', val=12)
try:
self.validate[i](val)
dict.__setitem__(self, i, val)
except KeyError:
raise (or warning), bad value
the validation dict and default properties would be populated during the
initial call to rc_params(), when the defaultParams dict is interpretted.
Thereafter, any attempt to set a parameter, either directly using
rcParams[i]=j or indirectly using rc(), will benefit from validation. The
behavior would otherwise be unchanged, I think. Any comments or objections?
Darren
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