根据对应的值替换值，不满足则保留值

Question

给定以下数据帧，

输入df:

tbody> <<tr>

cost_center	Pool_costs
90272
92705
98754
91350

iuc，可以使用isin

filt = df['Cost_centre'].isin([90272, 91350])
df.loc[filt, 'Pool_costs'] = 'B'

print(df)
Cost_centre Pool_costs
0        90272          B
1        92705          A
2        98754          A
3        91350          B