我正在运行一个简单的在线购物车程序,当我尝试运行它时,结果结果为空白。我理解关于类和对象的概念,但我真的需要帮助。它应该看起来像这样:
if (in_array(get_the_title(), $category)) {
$tripSelect[] = get_the_title() . '-selected';
} else {
$tripSelect[] = get_the_title();
}
} else {
$tripSelect[] = get_the_title();
}
endwhile;
}
}
echo json_encode($query);
这是我到目前为止所写的内容:
Item 1
Enter the item name: Chocolate Chips
Enter the item price: 3
Enter the item quantity: 1
Item 2
Enter the item name: Bottled Water
Enter the item price: 1
Enter the item quantity: 10
TOTAL COST
Chocolate Chips 1 @ $3 = $3
Bottled Water 10 @ $1 = $10
Total: $13
我做错了什么?
答案 0 :(得分:3)
您的print_item_cost
方法存在一些问题,应该是这样的:
def print_item_cost(self):
total = self.item_quantity * self.item_price
print('%s %d @ $%f = $%f' % (self.item_name, self.item_quantity, self.item_price, total))
您可以引用这样的类属性:self.attr