擅长:python、mysql、java
<p>您可以有一个<code>prev_line</code>,在这里存储前一行,并在仅给定条件的情况下读取一行时处理该行。</p>
<p>类似于:</p>
<pre><code>prev_line = None
for line in file:
if prev_line is not None and the start of the next line == "0":
perform pre-processing on prev_line
...
continue with normal processing
...
prev_line = line
</code></pre>
<p>如果需要,您可能需要对最后一行进行额外的处理,这取决于您的逻辑。</p>