register.py

print("小計: ", end="")
price = int(input(), 10)

print("お預かり: ", end="")
given = int(input(), 10)

change = given - price
if change < 0:
    print("不足しています")
    exit()

money_names = ['10000円札', '5000円札', '1000円札', '500円玉', '100円玉', '50円玉', '10円玉', '5円玉', '1円玉']
money_price = [10000, 5000, 1000, 500, 100, 50, 10, 5, 1]
change_list = []

for p in money_price:
    converted = change // p
    change_list.append(converted)
    change -= p * converted

for i, q in enumerate(change_list):
    if q == 0:
        continue
    print('{}: {}'.format(money_names[i], q))