Calculate percentage to roll a number while signs and portents is up

signs_and_portents.py

d6_x3_count = {}
d6_sp_count = {}
total_rolls = 0

for first in range(1,7):
  for second in range(1,7):
    for third in range(1,7):
      sum = first + second + third

      cur = d6_x3_count.get(sum, 0)
      d6_x3_count[sum] = cur + 1


      numbers = [first, second, third]
      numbers.sort(reverse=True)
      sum = numbers[0] + numbers[1]
      cur = d6_sp_count.get(sum, 0)
      d6_sp_count[sum] = cur +1
      total_rolls = total_rolls + 1

print(d6_sp_count)

for key, value in d6_sp_count.items():
  print("{}: {}%".format(key, float(value)/total_rolls*100))