project.py

item_names = ["Apple", "Bread", "Milk", "Eggs"]

item_prices = [1.0, 2.50, 3.00, 4.50]

item_stock = [100, 20, 50, 4]
while True :
    print("task")
    selectt = input()
    def checkinv(name,price,stock):
        for i in range(len(name)):
            print(f"name: {name[i]} | price: {price[i]} | stock: {stock[i]}")
            print("----------------------------------------")
    if selectt == "inventory" :
        checkinv(item_names,item_prices,item_stock)
    def purchase(product ,qty):
        index = -1
        for i in range(len(item_names)) :
            if product == item_names[i] :
                index = i
        if item_stock[index] < qty :
            print("insufficient stock")
        else :
            print(f"purchase of {qty} {product}")
            print(f"your total amount is {qty*item_prices[index]}")
            item_stock[index] = item_stock[index] - qty

        

    if selectt == "purchase" :
        print("Product Name:")
        product = input()
        print("Quantity")
        qty = int(input())
        purchase(product,qty)
        checkinv(item_names,item_prices,item_stock)