Iam getting a error like 'str' object has no attribute 'Buy'

Programming Aliceblue API
1 
def Alice_place_order_BUY(Instrument,Quantity,OrderType,ProductType,Price,TransactionType):

 for i in range(0,3):

  while True:

   try:

    print('Params:',Instrument,Quantity,OrderType,ProductType,Price,TransactionType);

    order_id = None ;#TransactionType=eval('{"Sell":"Sell","Buy":"Buy"}');print(TransactionType) #;exit()

    order_id = alice.place_order(transaction_type = TransactionType.Buy, #TransactionType,

                             instrument = Instrument,

                             quantity = Quantity,

                             order_type = OrderType.Market, #OrderType, #'MARKET', #

                             product_type = ProductType.Delivery, #ProductType.Intraday, #'I',# #ProductType,

                             price = Price,

                             trigger_price = None,

                             stop_loss = None,

                             square_off = None,

                             trailing_sl = None,

                             is_amo = False)

    return order_id

   except Exception as e:

    print("exception occured place_order:" + str(e))

    time.sleep(2)

    if i == 2:

      return ''

   break

   

Ret =  Alice_main()

##ALICE

instrument = None;instrument = Alice_get_instrument('BANKNIFTY','2021-08-05',35700,False,'CE')

print('Received instrument:',instrument)

if instrument != None :

 order_id = Alice_place_order_BUY(instrument,25,'MARKET','D',0.0,'BUY')

 print('Received order_id:',order_id)
2

This has to be encapsulated within str() function -
str(ProductType)
str(OrderType)

Right?

Also just do
print(e)

Or, use traceback

import traceback
try:
 #add your code
except:
printtraceback.format_exc())