Создание чека

max = b - len(right)
left = left.ljust(max, " ") if left < max else left[:max]

WIDTH = 40
 
 
def big_message(s):
    content = [
       "-" * WIDTH,
       "",
       s.center(WIDTH),
       "",
       "-" * WIDTH,
    ]
    return "\n".join(content)
 
 
class Market:
    def __init__(self, goods: dict):
        self.goods = goods
 
    def add_good(self, name: str, price):
        self.goods[name] = price
 
 
class Receipt:
    def __init__(self, market):
        self.market = market
        self.content = {}
 
    def add_line(self, name, count):
        self.content[name] = count
 
    def render(self):
        total = 0
        content = [
            big_message("Welcome to our shop!"),
            "",
        ]
        for name, count in self.content.items():
            if count > 1:
                left = "{} x {}".format(name, count)
            else:
                left = name
            cost = self.market.goods[name] * count
            total += cost
            right = str(cost)
            content.append("{} {}".format(left, right))
            max = WIDTH - len(right)
            left = left.ljust(max, " ") if left < max else left[:max]
        content.append("")
        content.append("-" * WIDTH)
        content.append("-" * WIDTH)
        content.append("")
        content.append("Total cost: {}".format(total))
        content.append("")
        content.append(big_message("Thank you!"))
        return "\n".join(content)
 
 
if __name__ == "__main__":
    shop = Market({"Beer": 39, "Cigaret": 112})
    shop.add_good("Fish", 19)
 
    shop_1_receipt = Receipt(shop)
 
    shop_1_receipt.add_line("Beer", 4)
    shop_1_receipt.add_line("Cigaret", 3)
    shop_1_receipt.add_line("Fish", 2)
    print(shop_1_receipt.render())

for name, count in self.content.items():
    ...
    mx = WIDTH - len(right) - 1
    left = left.ljust(mx, " ") if len(left) < mx else left[:mx]
    content.append("{} {}".format(left, right))