Вам просто нужно использовать pd.concat для этого:
data1 = data.loc[:,['name','address1','tran1']].rename(columns={"address1":
"address", "tran1": "tran"})
data2 = data.loc[:,['name','address2','tran2']].rename(columns={"address2":
"address", "tran2": "tran"})
data3 = data.loc[:,['name','address3','tran3']].rename(columns={"address3":
"address", "tran3": "tran"})
pd.concat([ data1 , data2 , data3])