6 lines
147 B
Python
6 lines
147 B
Python
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#create a list
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l = [("x", 1), ("x", 2), ("x", 3), ("y", 1), ("y", 2), ("z", 1)]
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d = {}
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for a, b in l:
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d.setdefault(a, []).append(b)
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print (d)
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