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d = dict.fromkeys([1, 2, 3, 4])
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l = list(d.keys())
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l.sort()
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print(l)
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d = dict.fromkeys([1, 2, 3, 4], 42)
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l = list(d.values())
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l.sort()
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print(l)
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# argument to fromkeys has no __len__
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d = dict.fromkeys(reversed(range(1)))
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#d = dict.fromkeys((x for x in range(1)))
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print(d)
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