adding a new column in pandas dataframe from another dataframe with different index

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Christopher
27 Jun 2018
1# pre 0.24
2feature_file_df['RESULT'] = RESULT_df['RESULT'].values
3# >= 0.24
4feature_file_df['RESULT'] = RESULT_df['RESULT'].to_numpy()
source
Paul
03 Jul 2019
1merge(left, right, how='left', on=None, left_on=None, right_on=None,
2      left_index=False, right_index=False, sort=True,
3      suffixes=('_x', '_y'), copy=True)
4
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