gistfile1.txt

merchant_df = load_merchant() # load merchants dataframe
merchant_df = aggregation_merchants(merchant_df)# perform agg on merchnats data
merchant_df.columns=['merchants_'+c if c!='merchant_id' else c for c in merchant_df.columns] # generate new column name for merchnats data 
hist_trans_df = hist_trans_df.merge(merchant_df,on='merchant_id',how='left')# perform merge operation with historical transactions data based on merchant_id