Comment #1 on issue 3614 by [email protected]: Named arguments
http://code.google.com/p/sympy/issues/detail?id=3614
This is done in SymPy.stats with the NamedArgsMixin class
class NamedArgsMixin(object):
_argnames = ()
def __getattr__(self, attr):
try:
return self.args[list(self._argnames).index(attr)]
except ValueError:
raise AttributeError("'%s' object has not attribute '%s'" % (
type(self).__name__, attr))
class NormalDistribution(..., NamedArgsMixin):
_argnames = ('mean', 'std')
....
This method depends on __getattr__ which may degrade performance. See
discussion at https://github.com/sympy/sympy/pull/1720
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