sort by two columns in pandas
df.sort_values(['a', 'b'], ascending=[True, False])
sort by two columns in pandas
df.sort_values(['a', 'b'], ascending=[True, False])
pandas sort values by multiple columns
df = df.sort_values(["b", "c"], ascending = (False, True))
how to sort values in numpy by one column
sorted_array = an_array[numpy.argsort(an_array[:, 1])]
pandas merge sort columns
result = df1.merge(df2, how='outer').sort_index(axis=1)
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