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[[]]
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2023-12-22
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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