色々方法あるんだろうけど。
>>> from collections import Counter
>>> [ k for k, v in Counter([0,1,2,3,2,0,4]).items() if v > 1 ]
[0, 2]
>>> [ k for k, v in Counter("abcefacc").items() if v > 1 ]
['c', 'a']
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色々方法あるんだろうけど。
>>> from collections import Counter
>>> [ k for k, v in Counter([0,1,2,3,2,0,4]).items() if v > 1 ]
[0, 2]
>>> [ k for k, v in Counter("abcefacc").items() if v > 1 ]
['c', 'a']
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