pandas sort values by multiple columns code example

Example 1: sort by two columns in pandas

df.sort_values(['a', 'b'], ascending=[True, False])

Example 2: pandas sort values by multiple columns

df = df.sort_values(["b", "c"], ascending = (False, True))

Example 3: how to sort values in numpy by one column

sorted_array = an_array[numpy.argsort(an_array[:, 1])]

Example 4: pandas merge sort columns

result = df1.merge(df2, how='outer').sort_index(axis=1)