AssertionError: Start slice bound is non-scalar

报错源代码

        df = pd.read_csv("userFile.csv")
        row = df[(df['tel'] == int(tel))].index.tolist()
        print(row)
        print(password)
        df.loc[row:row, ('password')] = [str(password)]
        df.to_csv('userFile.csv', index=False)