擅长:python、mysql、java
<p>它应该与while循环中使用的变量相同。你知道吗</p>
<pre><code>num = int(input('Enter a number, -999 to quit: '))
if num != -999:
list1.append(num)
</code></pre>
<p>以及</p>
<pre><code># final = str(y) This is not required, why cast list as str
final = ' '.join(final)
</code></pre>