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我有一個熊貓數據框，我需要添加一個新列，這個列將基於特定列的計算，由列'site'指示。我已經找到了一種方法來做到這一點，訴諸numpy，但它總是警告鏈接索引。我相信應該有更好的解決方案，請幫助，如果你知道。pandas dataframe在其他列上添加新列，並避免鏈接索引
df_num_bin1['Chip_id_3']=np.where(df_num_bin1[key_site_num]==1,df_num_bin1[WB_89_S1]*0x100+df_num_bin1[WB_78_S1],df_num_bin1[WB_89_S2]*0x100+df_num_bin1[WB_78_S2])
df_num_bin1['Chip_id_2']=np.where(df_num_bin1[key_site_num]==1,df_num_bin1[WB_67_S1]*0x100+df_num_bin1[WB_56_S1],df_num_bin1[WB_67_S2]*0x100+df_num_bin1[WB_56_S2])
df_num_bin1['Chip_id_1']=np.where(df_num_bin1[key_site_num]==1,df_num_bin1[WB_45_S1]*0x100+df_num_bin1[WB_34_S1],df_num_bin1[WB_45_S2]*0x100+df_num_bin1[WB_34_S2])
df_num_bin1['Chip_id_0']=np.where(df_num_bin1[key_site_num]==1,df_num_bin1[WB_23_S1]*0x100+df_num_bin1[WB_12_S1],df_num_bin1[WB_23_S2]*0x100+df_num_bin1[WB_12_S2])
df_num_bin1['mac_low']=(df_num_bin1['Chip_id_1'].map(int) % 0x10000) *0x100+df_num_bin1['Chip_id_0'].map(int) // 0x1000000
上面的代碼具有2個問題：
1：在此列的值[key_site_num]確定哪些列我應該從提取芯片ID的數據。在這個例子中，它只是站點0或1，但實際上它也可以是2或3。我需要一個通用的解決方案。
2：它產生鏈接索引警告;
C:\Anaconda2\lib\site-packages\ipykernel\__main__.py:35: SettingWithCopyWarning:
A value is trying to be set on a copy of a slice from a DataFrame.
Try using .loc[row_indexer,col_indexer] = value instead