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2011-02-23T08:54:59.173
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2011-02-23T08:54:59.173
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I've thought of what I think is a cleaner solution for implementing a pure read-only attribute, if that's all you want. It's a variant of the solution tangentstorm gave, but dispenses with the need for a <code>__getattr__</code> method altogether. <pre><code>class Foo(object): def __init__(self): self.readonly = set() def set_readonly(self, attr, value): setattr(self, attr, value) self.readonly.add(attr) def __setattr__(self, attr, value): if hasattr(self, "readonly") and attr in self.readonly: raise AttributeError("Read only attribute: %s" % (attr,)) object.__setattr__(self, attr, value) </code></pre> It works like this: <pre><code>>>> f = Foo() >>> f.x = 5 >>> f.set_readonly("y", 9) >>> f.x, f.y (5, 9) >>> f.x = 7 >>> f.y = 1 Traceback (most recent call last): File "<stdin>", line 1, in <module> File "ro.py", line 13, in __setattr__ raise AttributeError("Read only attribute: %s" % (name,)) AttributeError: Read only attribute: y </code></pre> Making a read-only attribute read-write again is easy: <pre><code> def unset_readonly(self, attr): self.readonly.remove(attr) </code></pre> In my first attempt at writing this idea I used <code>self.__readonly</code> instead of <code>self.readonly</code>, but that leads to a problem with actually setting the <code>__readonly</code> attribute, since I'd need to do un-munge the "private" attribute to check for its presence (<code>hasattr(self, "_Foo__readonly")</code>), and this is discouraged.
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1. POSetting a property inside a Python method
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1. USLauritz V. Thaulow
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1. COThank you! I think using a set for read-only attrs is the best solution: clean and easy. Thank you for your effort! :)
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