Excel里面某一列所有相同的按顺序排列在下面行，不同的用空行隔开

import pandas as pd

def excel_sort(input_path, output_path):
    df = pd.read_excel(input_path)
    df.sort_values(by=['流水号','登记日期'], inplace=True)
    df.to_excel(output_path, index=False)

input_path = 'data/2019-4-1.xlsx'
output_path = 'data/2019-4-1-output.xlsx'
excel_sort(input_path, output_path)