Jean-Michel Pichavant <jeanmic...@sequans.com> wrote: > You simply don't return inconsistent types with a return statement. This > is a general rule in programming that has probably exceptions but > regarding what you're saying, you clearly don't want to do that.
I don't think they were intended to be inconsistent types, but subclasses of the same type. Returning different subclasses is exactly what a factory is for. And given Python's propensity for duck typing, they don't even really need to be subclassed for the same object, they just need the interface that is required. > Immagine the following code: > > oNumber = MyNumbers(random.int(100)) # note that oNumber is not a > MyNumbers instance... quite confusing don't you think ? > oNumber. ... wait a minute, which methods am I allowed to call ??? > SmallNumbers adn BigNumbers have differents methods. What if they have different implementations rather than methods? -- http://mail.python.org/mailman/listinfo/python-list
