I've got a base class "Asset", and currently have about 20 sub-classes (assetTypes) that will inherit from it, with more to follow, I'm sure. All of the assetTypes will have the same methods, but they'll be polymorphic; each assetType's methodA() will do something slightly different from it's sibling assetTypes.
What I want to do is to pass in the assetType at runTime via an external script, create a new instance of it, and then run that instance's methods. That way I won't have to have 20 or more " if assetType== " if/elif statements, and maintaining the script that creates new instances won't become a nightmare. And changing the base class' __init__ to contain another if/elif every time someone adds another assetType seems to be so wrong, I rejected that approach out of hand. I want to design this thing so that the base class doesn't need to know about all the sub-classes. Perhaps I'm taking the wrong approach here with the Asset/AssetType base-class/sub-class organization; it's beginning to feel that way. I've tried something like this: <asset.py> class Asset: pass <foo.py> class Foo(Asset): pass <script.py> from asset import Asset from foo import Foo klass = 'Foo' o = klass() which gets me 'string not callable', which is kind of expected. On p.325 of the O'Reilly Learning Python (2nd ed.), there's an example of generic instance creation, but the values passed in are class objects, not strings... I'm guessing that this works because it's all in the same module, so it knows that the things in the tuple iterated over in the foreach are classes. Any ideas? I'm an old hand at perl (10+ years), but very new to Python, so please be patient. John Burk _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
