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How do I order columns according to the values of the last row? In the example below, my final dataframe should have columns in the following order: 'ddd' 'aaa' 'ppp' 'fff'. >>> df = DataFrame(np.random.randn(10, 4), columns=['ddd', 'fff', 'aaa', 'ppp']) >>> df ddd fff aaa ppp 0 -0.177438 0.102561 -1.318710 1.321252 1 0.980348 0.786721 0.374506 -1.411019 2 0.405112 0.514216 1.761983 -0.529482 3 1.659710 -1.017048 -0.737615 -0.388145 4 -0.472223 1.407655 -0.129119 -0.912974 5 1.221324 -0.656599 0.563152 -0.900710 6 -1.816420 -2.898094 -0.232047 -0.648904 7 2.793261 0.568760 -0.850100 0.654704 8 -2.180891 2.054178 -1.050897 -1.461458 9 -1.123756 1.245987 -0.239863 0.359759
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