Hi, Le lundi 23 novembre 2015 10:55:40 UTC+1, Jeroen Demeyer a écrit : > > Of course, you could argue that Element > should not have __add__ and __mul__ (since not all elements can be added > or multiplied). But it doesn't really hurt to have them and raise > NotImplementedError (unless I'm missing something). > > Maybe a too naive remark: what you propose seems against standard object-oriented programming. Isn't it more clear to have a generic base class Element and implement __add__ and __mul__ only in derived classes, when relevant? Sorry, I don't know the details of the element classes, so you may have good reasons to do this...
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