Stacked/Unstacked 사용하여 데이터 재구조화하기

import numpy as np
import pandas as pd


def stacked():
    mul_index = pd.MultiIndex.from_tuples([('cust1','2015'),('cust1','2016'),('cust2','2015'),('cust2','2016')])

    data = pd.DataFrame(data=np.arange(16).reshape(4,4),
                        index=mul_index,
                        columns=['prd_1','prd_2','prd_3','prd_4'],
                        dtype='int')

    print(data)
    # 결과
    #               prd1    prd2    prd3    prd4
    # cust1 2015    0       1       2       3
    #       2016    4       5       6       7
    # cust2 2015    8       9       10      11
    #       2016    12      13      14      15
    return data

if __name__ == '__main__':
    data_stack = stacked().stack()
    print(data_stack)

    print(data_stack.index)