擅长:python、mysql、java
<p>首先,我很困惑。我猜你想要的第一部分如下</p>
<p>假设你已经准备好了你的品牌清单</p>
<pre><code>brands = ["AAA", "BBB", "CCC", "DDD", "EEE", "FFF", "GGG"]
companies = []
while True:
print (brands)
print('Choose from the above brands or enter nothing to stop')
brandindex = input()
if brandindex == '':
break
else:
companies.append(brands[int(brandindex)])
print (companies)
</code></pre>
<p>如果我输入索引1,2&;3、以下内容将从“公司”列表中打印出来</p>
<pre><code>['AAA', 'BBB', 'CCC', 'DDD', 'EEE', 'FFF', 'GGG']
Choose from the above brands or enter nothing to stop
1
['AAA', 'BBB', 'CCC', 'DDD', 'EEE', 'FFF', 'GGG']
Choose from the above brands or enter nothing to stop
2
['AAA', 'BBB', 'CCC', 'DDD', 'EEE', 'FFF', 'GGG']
Choose from the above brands or enter nothing to stop
3
['AAA', 'BBB', 'CCC', 'DDD', 'EEE', 'FFF', 'GGG']
Choose from the above brands or enter nothing to stop
['BBB', 'CCC', 'DDD']
</code></pre>
<p>这是我对第一部分的猜测。我不太明白你为什么要在之后马上打印<code>brand in companies</code>?从这个方向纠正我</p>