Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium EasyToFix
New issue 3652 by [email protected]: Make sure classes play nice with
potential subclasses
http://code.google.com/p/sympy/issues/detail?id=3652
I noticed this when fixing issue 3694. All methods of classes that return
another instance of that class should return self.func(*args) instead of
Class(*args). That way, if someone subclasses that class, that method will
automatically return an instance of the subclass, instead of the super
class.
In principle, this is easy to fix. Just go through the method definitions
of classes and make sure that they never create a new instance of the same
class directly. There might be some subtleties, though, where it is indeed
correct to create the superclass.
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