Am Montag, den 04.07.2005, 20:25 -0400 schrieb Roy Smith: > Steven D'Aprano <[EMAIL PROTECTED]> wrote: > > Should we *really* be encouraging newbies to mess with globals() and > > locals()? Isn't that giving them the tools to shoot their foot off before > > teaching them how to put shoes on? > > Why risk damaging perfectly good footwear? > > But, seriously, I agree with you. The cannonical way to tell if a variable > exists in Python is to try to access it and catch any resulting NameError. Although it should be said that this goes only for variables. obj.value isn't such a beast (even if some newbies might think so), and would throw an AttributeError.
Another thing to consider when it comes to footwear: Ruining it once and enduring the resulting discomfort teaches quite well. And leaves a respect for the "magic" features of Python that stays the rest of one's life :) So I think every newbie at some time of his/her learning process should probably have fun with all the cool features of Python (be it globals(), assigning to __builtins__, __getattr__ and derived classes, or what ever ;) ). Playing alone is not enough, but playing and living to maintain the code afterwards is very educative ;) OTOH, perhaps for me it was teaching more, because I have been forced to maintain by first bigger python application almost for a decade. One learns quite a bit about software engineering this way ;) Andreas
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