擅长:python、mysql、java
<p>您需要<code>__str__()</code>方法。下面是一个完整的工作实施。你知道吗</p>
<pre><code>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!")
</code></pre>