Find Candidate UTXO

find_candidate.py

import random
import decimal

cost = 0.10
sending_amount = 0.71

class UTXO(object):
    id = 0
    amount = 0

    # The class "constructor" - It's actually an initializer 
    def __init__(self, id, amount):
      self.id = id
      self.amount = amount
        
    def __str__(self):
      return "UTXO: id %s amount %s" % (self.id, self.amount)

def random_amount():
  a = float(random.randrange(0, 100))/100
  return a

utxo_list = []

for x in range(0, 10):
  utxo_list.append(UTXO(x, random_amount()))

#add items for testing
utxo_list.append(UTXO(10, sending_amount))
utxo_list.append(UTXO(12, cost + sending_amount + random_amount()))
utxo_list.append(UTXO(11, cost + sending_amount))

utxo_sorted = sorted(utxo_list, key=lambda utxo: utxo.amount)

def find_candidate(unspent, fee, amount):
  total = fee + amount
  for utxo in unspent:
    print(utxo)
    if utxo.amount >= total:
        return utxo
        
candidate = find_candidate(utxo_sorted, cost, sending_amount)

if(candidate != None):
  print("Candidate:", candidate)