How to use 'concatenate pandas dataframes vertically' in Python

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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
56def _concat_df(data, temp):
58 oh = onehot(data)
59 temp = pd.concat([temp, oh], axis=1)
61 return temp

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