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    <p>You could subclass the <a href="http://docs.python.org/dev/library/collections.html#collections.OrderedDict" rel="nofollow">collections.OrderedDict</a> class. For example:</p> <pre><code>import collections class Child(object): def __init__(self, id, name): self.id = id self.name = name def __repr__(self): return 'Child(\'%s\', \'%s\')' % (self.id, self.name) class MyOrderedDict(collections.OrderedDict): def __init__(self, *args, **kwds): super(MyOrderedDict, self).__init__() if len(args) &gt; 0: for i in args[0]: super(MyOrderedDict, self).__setitem__(i.id, i) def __getitem__(self, key): if isinstance(key, int): return super(MyOrderedDict, self).__getitem__(self.keys()[key]) if isinstance(key, slice): return [super(MyOrderedDict, self).__getitem__(k) for k in self.keys()[key]] return super(MyOrderedDict, self).__getitem__(key) def append(self, item): super(MyOrderedDict, self).__setitem__(item.id, item) def pop(self, key = None, default = object()): if key is None: return self.popitem() return super(MyOrderedDict, self).pop(self.keys()[key], default = default) class Classroom(object): def __init__(self, children): self.children = MyOrderedDict(children) classroom = Classroom([Child('389', 'pete')]) print repr(classroom.children[0]) classroom.children.append(Child('2344', 'joe')) print repr(classroom.children.pop(0)) print repr(classroom.children['2344']) print repr(classroom.children[0:1]) </code></pre> <p>This code outputs:</p> <pre><code>Child('389', 'pete') Child('389', 'pete') Child('2344', 'joe') [Child('2344', 'joe')] </code></pre>
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    1. POpython list/dict property best practice
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    1. COOrderedDict is only available in python 2.7 I believe? Any way to do this in 2.6?
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    2. CO@jterrace: http://pypi.python.org/pypi/ordereddict
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    3. COGot it working with the pypi version of OrderedDict, but it breaks on other list operations like classroom.children[0:1]
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