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Set
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---
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Additional powerful sets.
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.. py:class:: pydu.set.OrderedSet(iterable=None)
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A set which keeps the ordering of the inserted items.
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>>> from pydu.set import OrderedSet
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>>> s = OrderedSet([1, 3, 1, 2])
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>>> list(s)
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[1, 3, 2]
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>>> s.discard(3)
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>>> list(s)
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[1, 2]
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