擅长:python、mysql、java
<p>您可以轻松地一次完成,而无需使用其他数据结构(<em>免责声明:未经测试</em>):</p>
<pre><code>with open('source.txt') as fin, open('destination.txt', 'w') as fout:
for line in fin:
lastname, firstname = line.strip().split(', ')
fout.write(f'{firstname}, {lastname}\n')
</code></pre>