擅长:python、mysql、java
<p>假设您以字符串<code>'2010_05_1'</code>开头。那么前一天的类似字符串是:</p>
<pre><code>>>> import datetime
>>> s = '2010_05_1'
>>> theday = datetime.date(*map(int, s.split('_')))
>>> prevday = theday - datetime.timedelta(days=1)
>>> prevday.strftime('%Y_%m_%d')
'2010_04_30'
>>>
</code></pre>
<p>当然,您将把所有这些封装到一个方便的函数中!</p>