我首先创建一个熊猫系列，其中包含我想要的值和列。例如：

I would first create a pandas series that contain the values and columns I want. for example:

new_values= pd.Series(["a", "b"], index=["one", "two"])

然后我将该系列附加到原始数据框：

Then I would append this series to the original dataframe:

df= df.append(new_values, ignore_index=True)