我试图创建一个简单的水果店，销售苹果和葡萄。我设置了每种水果的数量是随机的。
如果你要的葡萄比商店里的多，我希望代码循环回来，要求另一个输入。我被卡住了。下面是我的代码：

import random

amount_of_apples = random.randint(1, 100)
price_of_apples = random.randint(1, 10)
amount_of_grapes = random.randint(1, 50)
price_of_grapes = random.randint(5, 15)

stock = ["apples","grapes"]
basket = []
greeting = """Hello and welcome to Pennants."""
availability = "We have the following fruits available to purchase " + stock[0] + " and " + stock[1]
print(greeting)
print(availability)
print("""We have %s Apples available to purchase. Each Apple cost £%s.""" % (amount_of_apples, price_of_apples))
print("""We have %s bunches of grapes available to purchase. Each bunch of grapes cost £%s.""" % (amount_of_grapes, price_of_grapes))
order = input("What would you like to purchase?")
if order == " Grapes":
    basket.append("Grapes")

def order_check():
    G2 = input("How many bunches of grapes would you like to buy?")
    print("Your basket:" + G2 + basket[0])
    Correct = "Yes"
    Incorrect = "No"
    M = int(G2) * price_of_grapes
    if int(G2) > amount_of_grapes:
        print("""Unfortunately we don't have enough grapes to fufil your request. 
    We have %s grapes available to buy.""" % (amount_of_grapes))
order_check()