How to use 'add two dataframes pandas' in Python

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142def append_data(df1, df2):
143 '''
144 Append df2 to df1
145 '''
146 df = pd.concat((df1, df2))
147 return df.groupby(df.index).first()

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29def _concat(df, type):
30 if df is None:
31 df = pd.DataFrame(_object_blocks[type])
32 else:
33 _df = pd.DataFrame(_object_blocks[type])
34 df = pd.concat([df, _df], sort=True)
35 return df

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