df = pd.DataFrame(np.arange(4).reshape(2, -1))
pd.concat([df, df.iloc[[0]]]) # df.iloc[[i]] ~ df
pd.concat([df, df.iloc[0]]) # df.iloc[i] ~ series![pd.concat(df, series) iloc[] 与 iloc[[]]_pd](https://file.cfanz.cn/uploads/png/2023/12/22/9/eGT07ddaL2.png)
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pd.concat(df, series) iloc[] 与 iloc[[]]
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df = pd.DataFrame(np.arange(4).reshape(2, -1))
pd.concat([df, df.iloc[[0]]]) # df.iloc[[i]] ~ df
pd.concat([df, df.iloc[0]]) # df.iloc[i] ~ series
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