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Here is a snippet of the answer: def Struct(*args, **kwargs): def init(self, *iargs, **ikwargs): for k,v in kwargs.items(): setattr(self, k, v) for i in range(len(iargs)): setattr(self, args[i], iargs[i]) for k,v in ikwargs.items(): setattr(self, k, v) name = kwargs.pop("name", "My Struct") kwargs.update(dict((k, None) for k in args)) return type(name, (object,), ) In essence my question is to find out if it is possible to create a new property in runtime. Typically, I want to use properties when I need to begin managing access to an attribute in code that has downstream usage, so that I can maintain a consistent API.

These resources often explore simplistic ethical questions, such as "Should Jane steal from the company?

ks = ['ab', 'cd'] vs = [12, 34] class C(dict): def __init__(self, ks, vs): for i, k in enumerate(ks): self[k] = vs[i] setattr(self, k, property(lambda x: vs[i], self.fn_readyonly)) def fn_readonly(self, v) raise "It is ready only" if __name__ == "__main__": c = C(ks, vs) print Anyway, I suspect this is why descriptors only work on classes: they're a formalization of the stuff that powers classes in the first place.

They're even the exception to the rule: you can obviously assign descriptors to a class, and classes are themselves instances of ; it's just idiomatic for descriptors to return themselves when accessed as class attributes.

Object systems are well suited for runtime update, as encapsulation clearly separates internal structure and external services.

This paper considers a type-safe asynchronous mechanism for dynamic class upgrade, allowing class hierarchies to be updated in such a way that the existing objects of the upgraded class and of its subclasses gradually evolve at runtime.




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