擅长:python、mysql、java
<p>看来您需要返回值。在</p>
<p>尝试:</p>
<pre><code>class IceCreamMachine:
all={}
def __init__(self, ingredients, toppings):
self.ingredients = ingredients
self.toppings = toppings
def scoops(self):
res = []
for i in self.ingredients:
for j in self.toppings:
res.append([i, j])
return res
machine = IceCreamMachine(["vanilla", "chocolate"], ["chocolate sauce"])
print(machine.scoops())
</code></pre>