Question #278

I am ordered, mutable, and I don't allow duplicates. What am I?

Out of all types listed above, only the OrderedDict is ordered, mutable and doesn't allow duplicates. (docs.python.org/2/library/collections.html)


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Question difficulty: ๐Ÿ”ต๐Ÿ”ต๐Ÿ”ต๐Ÿ”ต๐Ÿ”ต


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