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    <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>&gt;&gt;&gt; from collections import namedtuple &gt;&gt;&gt; _Widget = namedtuple("Widget", "propertyA propertyB propertyC propertyD propertyE propertyF propertyG propertyH propertyI") &gt;&gt;&gt; DefaultWidget = _Widget(None, 55, "Default", None, None, None, None, None, None) &gt;&gt;&gt; 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>&gt;&gt;&gt; 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>&gt;&gt;&gt; Widget() Traceback (most recent call last): File "&lt;stdin&gt;", line 1, in &lt;module&gt; TypeError: Widget() takes exactly 1 argument (0 given) </code></pre> <p>or if you give a property that doesn't exist:</p> <pre><code>&gt;&gt;&gt; Widget("test", propertyZ="test2") Traceback (most recent call last): File "&lt;stdin&gt;", line 1, in &lt;module&gt; File "&lt;stdin&gt;", line 2, in Widget File "&lt;string&gt;", 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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    1. POPreferring dictionaries over objects in Python
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    1. CONot really the question, but true that this is much nicer than doing it with just a dictionary. It's not particularly fast, though.
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    2. COCan you clarify why you think it's not fast?
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    3. COsee [What is the fastest to access struct-like object in Python?](http://stackoverflow.com/questions/2646157/what-is-the-fastest-to-access-struct-like-object-in-python)
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