根据熊猫中的条件重置总和

用途

groupby.cumsum

df['Cumulative'] = df.groupby('TransactionId')['Delta'].cumsum()print (df)  TransactionId  Delta  Cumulative0       14         2       21       14         3       52       14         1       63       14         2       84       15         4       4 5       15         2       6 6       15         3       9