<blockquote>
<p><strong>Possible Duplicate:</strong><br/>
<a href="https://stackoverflow.com/questions/441147/how-can-i-subtract-a-day-from-a-python-date">How can I subtract a day from a python date?</a> </p>
</blockquote>
<p>我有一组按日期保存的文件,year_month_day.txt格式。我需要打开前一天的文本文件进行一些处理。如何在python中找到前一天的日期?</p>