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Comparing The Solutions

  • First solution:

    d = {}
for i in X + Y:
   d[i] = 1
Z = d.keys()

  • Second solution:

    Z = dict([(t, 1) for t in X + Y]).keys()

Timing tests show that the second solution is between 2 to 3 times slower than the first solution for lists of between a hundred and a few tens of thousands of elements.

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