Hello, I want to be able to say stuff like "import CJB.ClassA" and "import CJB.ClassB" then say "c = CJB.ClassA()" or "c = CJB.ClassB()". CJB will be a directory containing files "ClassA.py" and "ClassB.py".
Now that I think about it, that can't work because Python allows you import different things from the same module (file). If I said "import CJB.ClassA", I'd have to instantiate ClassA like "c = CJB.ClassA.ClassA()".
I guess I could say "from CJB.ClassA import ClassA", but then I'd instantiate like "c = ClassA()". What I really want is to say "c = CJB.ClassA()"...is that possible?
Is my understand of modules/packages correct or am I way off?
To collapse the namespace locally (i.e. in the module you're currently writing, rather than in the package you're referring to), you can use a convention like:
from CJB.ModuleA import ClassA as CJB_A from CJB.ModuleB import ClassB as CJB_B
This also has the advantage of being slightly faster - each '.' in a name represents another namespace lookup, which happens at run time, not compile time. This can end up mattering if the lookup is being done inside a loop.
The above idiom gives you a reference directly to the classes you want to use, thus allowing them to be found directly in the module's own dictionary.
Cheers, Nick. -- http://mail.python.org/mailman/listinfo/python-list
