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copied!<p>You could implement this nicely with <a href="http://docs.python.org/library/collections.html#collections.namedtuple" rel="nofollow">namedtuple</a>. For example, you could create a Widget namedtuple with default values:</p> <pre><code>>>> from collections import namedtuple >>> _Widget = namedtuple("Widget", "propertyA propertyB propertyC propertyD propertyE propertyF propertyG propertyH propertyI") >>> DefaultWidget = _Widget(None, 55, "Default", None, None, None, None, None, None) >>> DefaultWidget Widget(propertyA=None, propertyB=55, propertyC='Default', propertyD=None, propertyE=None, propertyF=None, propertyG=None, propertyH=None, propertyI=None) </code></pre> <p>Then, you can have a function called Widget that initializes the properties:</p> <pre><code>def Widget(propertyA, **kwargs): return DefaultWidget._replace(propertyA=propertyA, **kwargs) </code></pre> <p>Then you can use it like this:</p> <pre><code>>>> Widget("test", propertyE=17) Widget(propertyA='test', propertyB=55, propertyC='Default', propertyD=None, propertyE=17, propertyF=None, propertyG=None, propertyH=None, propertyI=None) </code></pre> <p>Note that if you try to omit the required propertyA:</p> <pre><code>>>> Widget() Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: Widget() takes exactly 1 argument (0 given) </code></pre> <p>or if you give a property that doesn't exist:</p> <pre><code>>>> Widget("test", propertyZ="test2") Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 2, in Widget File "<string>", line 32, in _replace ValueError: Got unexpected field names: ['propertyZ'] </code></pre> <p>it handles it in a nice way. I think using namedtuple would get rid of your drawbacks about using a dictionary.</p>

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