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Ordered Dictionary

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        This is part of the <a href=>pythonutils</a> package.
od = OrderedDict()
od['key1'] = 'value 1'
od['key2'] = 'value 2'
print od
{'key1': 'value 1', 'key2': 'value 2'}

print od.sequence
['key1', 'key2']
print od
{'key2': 'value 2', 'key1': 'value 1'}
print od.sequence
['key2', 'key1']
This dict keeps its insertion order and you can do other
manipulations. See more details <a href=>here</a>