python set type dose not support indexing
e.g.
a=set([1,2])
means you can't use a[1] or a[:1] etc.
because set dosen't have orders.
e.g.
a=set([1,2])
means you can't use a[1] or a[:1] etc.
because set dosen't have orders.
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python set type dose not support indexing
e.g. a=set([1,2]) means you can't use a[1] or a[:1] etc. because set dosen't have orders. 
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