擅长:python、mysql、java
<p>您可能需要使用<code>.get()</code>从dict获取相应的值,如果它不存在,您将使用<code>None</code></p>
<pre><code>order1 = input("Welcome to the pizza store what size pizza can we get for you (small, medium, large, or x-large): " )
size_price = pizzaSize.get(order1)
if size_price is not None:
price += size_price
else:
print(f"Sorry the size '{order1}' doesn't exist")
exit(1)
</code></pre>