readonly also prevents deletion
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@ -264,6 +264,9 @@ class PropertyReadOnly(PropertyDelegator):
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def __setitem__(self, key, value):
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raise PropertyWriteError(key)
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def __delitem__(self, key):
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raise PropertyWriteError(key)
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class PropertyStack(PropertyManager):
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def __init__(self):
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@ -13,3 +13,11 @@ class PropertyReadOnlyTest(TestCase):
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ro["otherkey"] = "testvalue"
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self.assertEqual(ro["testkey"], "initial value")
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self.assertNotIn("otherkey", ro)
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def testPreventsDeletes(self):
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layer = PropertyLayer(testkey="some value")
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ro = PropertyReadOnly(layer)
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with self.assertRaises(PropertyWriteError):
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del ro["testkey"]
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self.assertEqual(ro["testkey"], "some value")
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self.assertEqual(layer["testkey"], "some value")
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