如何解决无法分配给此 Python 代码中的函数调用

#Start cleaning loop through all the pings
for P in Pings:
    
    #All beams for current ping
    print("Cleansing completed", round(P/len(Pings)*100,1),"%")
    
    Slice_one = df[(df.P==P)&(df.Bm>0)&(df.Bm<257)].copy()
    
    model = LinearRegression().fit(Slice_one.Bm.values.reshape((-1,1)), Slice_one.Z.values)
    
    Slice_one["Z_1"] = model.predict(Slice_one.Bm.values.reshape((-1,1)))
    
    Slice_one("dZ") = abs(Slice_one.Z_1 - Slice_one.Z)
    
    Slice_one_Cor = Slice_one[(Slice_one.dZ < 0.4)]
    
    Slice_one_Cor.drop(["Z_1", "dZ"], axis = 1, inplace = True)
    
    df_Clean = pd.concat([df.Clean, Slice_one_cor], ignore_index = True)
    

文件“”，第 13 行 Slice_one("dZ") = abs(Slice_one.Z_1 - Slice_one.Z) ^ SyntaxError：无法分配给函数调用