定义一个手机(Phone)类，在类中定义品牌(brand)和价格(price)属性， 实例化2个手机对象，分别输出对象的品牌和价格。

class Phone:
def __init__(self, brand, price):
self.brand = brand
self.price = price

phone1 = Phone("Apple", 999)
phone2 = Phone("Samsung", 699)

print(phone1.brand, phone1.price)
print(phone2.brand, phone2.price)