pandas.DataFrame.sort_values
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DataFrame.sort_values(by, axis=0, ascending=True, inplace=False, kind='quicksort', na_position='last')[source]
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Sort by the values along either axis New in version 0.17.0. Parameters: by : str or list of str Name or list of names which refer to the axis items. axis : {0 or ‘index’, 1 or ‘columns’}, default 0 Axis to direct sorting ascending : bool or list of bool, default True Sort ascending vs. descending. Specify list for multiple sort orders. If this is a list of bools, must match the length of the by. inplace : bool, default False if True, perform operation in-place kind : {‘quicksort’, ‘mergesort’, ‘heapsort’}, default ‘quicksort’ Choice of sorting algorithm. See also ndarray.np.sort for more information. mergesortis the only stable algorithm. For DataFrames, this option is only applied when sorting on a single column or label.na_position : {‘first’, ‘last’}, default ‘last’ firstputs NaNs at the beginning,lastputs NaNs at the endReturns: sorted_obj : DataFrame 
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    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.DataFrame.sort_values.html