That's a really neat way of doing it, thanks a lot! I hadn't realized how accessible all those globals() dictionaries were. Guess my example still falls in the 99%... :) --- nadeem
> > def defineStruct(name, *parameters): > class _struct: > def __init__(self, *init_parameters): > for pname, pvalue in zip(parameters, init_parameters): > setattr(self, pname, pvalue) > globals()["make" + name] = _struct > for parameter in parameters: > def getter(o, parameter=parameter): > return getattr(o, parameter) > globals()[name + parameter] = getter > globals()["is" + name] = lambda o: isinstance(o, _struct) > > You might do other things, of course, like stepping up the frames from > sys._getframe() to inject the functions into the callers global scope. > There are some obvious optimizations you could make, too, as well as > other "methods" you might want to add. > > > > > I understand that all this can be done with classes and OO > > programming, but the whole point of the HtDP curriculum is to > > introduce students to programming in a pedagogically-effective way > > using a functional approach instead of OO-first. They do it in Scheme, > > which is primarily a f.p. language, and I'm trying to replicate a > > similar approach in Python. The defineStruct thing is basically meant > > to be a macro that introduces a set of functions for whatever > > structure definition is needed. > > > So, for these reasons, I don't believe the closure example above is > > helpful. I don't want to have to tell students anything about > > closures, and certainly have them worrying about functions returning > > functions, and function pointers, etc. I'm trying to bundle all that > > up behind the scenes. > > > So, thinking about my problem again, an alternate question may be: Is > > it possible, in a function called in a module, to access and update > > the global definitions (dictionary or whatever) in the caller module. > > > --- nadeem > > -- > >http://mail.python.org/mailman/listinfo/python-list > > -- > Read my blog! I depend on your acceptance of my opinion! I am > interesting!http://techblog.ironfroggy.com/ > Follow me if you're into that sort of thing:http://www.twitter.com/ironfroggy -- http://mail.python.org/mailman/listinfo/python-list
