Python 类别方法

Question

我是 Python 新手，正在类里面学习可在 Python 中使用的基本方法。我有这个作业问题，我真的不知道如何解决，所以我想知道你是否可以帮助我解决这个问题。问题是这样的:

class Doughnut:
    categories = ['cakey', 'doughy']
    def __init__(self, category, flavor):
        if category not in Doughnut.categories:
            self.category = 'doughy'
        else:
            self.category = category
        self.flavor = flavor

    def ___________:
        return self.category + " " + self.flavor + "doughnuts" 

d = Doughnut('cakey', 'bacon')
print("I want 2 " + str(d) + "s please!") # I want 2 cakey bacon doughnuts please!

我需要知道在第二个“def”和“:”之间的空白语句中写什么。先感谢您!

Answer 1

您需要__str__()方法。完整的工作实现如下。

class Doughnut:
  categories = ['cakey', 'doughy']


  def __init__(self, category, flavor):
    if category not in Doughnut.categories:
        self.category = 'doughy'
    else:
        self.category = category
    self.flavor = flavor


  def __str__(self):
    return self.category + " " + self.flavor + " doughnuts"


d = Doughnut('cakey', 'bacon')
print("I want 2 " + str(d) + "s please!")