pd merge on multiple columns
new_df = pd.merge(A_df, B_df, how='left', left_on=['A_c1','c2'], right_on = ['B_c1','c2'])
pd merge on multiple columns
new_df = pd.merge(A_df, B_df, how='left', left_on=['A_c1','c2'], right_on = ['B_c1','c2'])
how to append a dataframe to another dataframe in pandas
# all_res is list of DataFrames : [ dataframe, dataframe, ... ]
df_res = pd.concat(all_res)
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