擅长:python、mysql、java
<p>对于产品中不存在case项=>;我将其设置为0。你知道吗</p>
<p><code>shopping_list = ["shampoo", "brush", "shampoo", "soap", "soap", "dog food", "soap"]
products = {'shampoo': 2, 'brush': 1, 'soap': 3, 'dog food': 5}
final_result = {}
for item in shopping_list:
if item in final_result:
final_result[item] += products.get(item,0)
else:
final_result[item] = products.get(item,0)
return final_result</code></p>