python中是否有办法为多个组使用上一行的值？

问题描述

我有以下数据框（比利时）：

 Count_Flights  my_network  partner_country year_month  Perct_Use   X
 202    Austria Belgium 202008  nan nan
 127    Denmark Belgium 202008  nan nan
 428    Austria France  202008  nan nan
 700    Denmark France  202008  nan nan
 nan    Austria Belgium 202009  0.98    nan
 nan    Denmark Belgium 202009  0.98    nan
 nan    Austria France  202009  0.98    nan
 nan    Denmark France  202009  0.98    nan

我希望实现的是Count_Flights = Count_Flights [0] * Perct_Use [1]，即；对于202009

 Austria Belgium = 202 * 0.98
 Denmark Belgium = 127*0.98

我尝试了以下代码：

Belgium["X"]=np.nan


for part in partner:
    country_confirmed_df = Belgium[(Belgium['partner_country'] == country)]
    states_in_country = country_confirmed_df['my_network'].unique()
    
      for i in range(1,len(Belgium)):
          print(network,part)
          print(Belgium.loc[i-1,'Count_Flights']*Belgium.loc[i,'Perct_Use'])

但是最终会收到“ KeyError”

我也尝试过使用if和if进行换班。

解决方法

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