Sending IOTA transaction in more granular way: API calls Prepare_transfer() and Send_transfer()

IOTA101_07CFD43B146C.py

# The snippet is a part of the IOTA Developer Essentials project. You can reach it at https://hribek25.github.io/IOTA101/
# Complete description and story behind the snippet is available at: https://hribek25.github.io/IOTA101/Allchapters_python.ipynb.html#07CFD43B146C
# Requirement: PyOTA library (!pip install pyota)

import iota
from datetime import datetime
from pprint import pprint

MySeed = b"HGW9HB9LJPYUGVHNGCPLFKKPNZAIIFHZBDHKSGMQKFMANUBASSMSV9TAJSSMPRZZU9SFZULXKJ9YLAIUA"
TargetAddress1 = b"CXDUYK9XGHC9DTSPDMKGGGXAIARSRVAFGHJOCDDHWADLVBBOEHLICHTMGKVDOGRU9TBESJNHAXYPVJ9R9"
TargetAddress2 = b"CYJV9DRIE9NCQJYLOYOJOGKQGOOELTWXVWUYGQSWCNODHJAHACADUAAHQ9ODUICCESOIVZABA9LTMM9RW"

NowIs = datetime.now() # get a actual date & time - just to have some meaningfull info

# preparing transactions
pt = iota.ProposedTransaction(address = iota.Address(TargetAddress1), # 81 trytes long address
                              message = iota.TryteString.from_unicode('Here comes a first message. Now is %s' % (NowIs)),
                              tag     = iota.Tag(b'HRIBEK999IOTA999TUTORIAL'), # Up to 27 trytes
                              value   = 0)

pt2 = iota.ProposedTransaction(address = iota.Address(TargetAddress2), # 81 trytes long address
                               message = iota.TryteString.from_unicode('Here comes a second message. Now is %s' % (NowIs)),
                               tag     = iota.Tag(b'HRIBEK999IOTA999TUTORIAL'), # Up to 27 trytes
                               value   = 0)
# besides the given attributes, library also adds a transaction timestamp


api = iota.Iota("https://field.deviota.com:443")

# Creating bundle, preparing inputs and finalizing bundle. It returns trytes of prepared TXs
Trytes = api.prepare_transfer(transfers=[pt,pt2]) 
    
print("Almost prepared bundle - tips and POW are still missing")
pprint(Trytes)
    
print("\nSearching for tips and performing POW... Wait please...")
Result = api.send_trytes(trytes=Trytes["trytes"],
                         depth=3) # Searching for tips, performing POW and broadcasting

print("Bundle was broadcasted.")
  
print("\nFinal transactions were returned - including nonce (POW)")
pprint(Result)