On Apr 20, 2010, at 5:35 PM, Jason Grout wrote:
Hi all,
In sage/devel/symbolic/ring.pyx, I find this in the
SymbolicRing.__init__:
self._populate_coercion_lists_(convert_method_name='_symbolic_')
Later on, I find this in SymbolicRing._element_constructor_:
elif hasattr(x, '_symbolic_'):
return x._symbolic_(self)
Isn't that check for the _symbolic_ method redundant? Is there any
reason for that check in _element_constructor_ to be there? I
commented it out and it seems to work just fine.
Thanks---I'm just trying to understand the coercion model a bit
better.
You're completely correct--the hasattr(x, '_symbolic_') is probably
just a hold over from before the coercion overhaul (or an omission
when SR was moved over to the new coercion model).
- Robert
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