設置和檢索類中屬性的默認值

Question

我在谷歌 colab 筆記本中使用 python。 我創建了一個 Restaurant 類並設置屬性 number_served = 0 的默認值。還創建了該類的一個實例 new_restaurant。 當我嘗試檢索實例的屬性值時出現錯誤：

class Restaurant:
  """creating Restaurant class"""
  def __init__(self, name, cuisine_type):
    self.name = name
    self.cuisine_type = cuisine_type
    self.number_served = 0
  
new_restaurant = ('Secret Sky', 'coffee & sandwiches')
new_restaurant.number_served

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AttributeError Traceback (last last call last) in () 7 8 new_restaurant = ('Secret Sky', 'coffee & sandwiches') ----> 9 new_restaurant.number_served

AttributeError：“元組”對象沒有屬性“number_served”

Answer 1

當您創建餐廳類的實例時，您必須像這樣調用它。

class Restaurant:
  """creating Restaurant class"""
  def __init__(self, name, cuisine_type):
    self.name = name
    self.cuisine_type = cuisine_type
    self.number_served = 0
  
new_restaurant = Restaurant('Secret Sky', 'coffee & sandwiches')
print(new_restaurant.number_served)