擅长:python、mysql、java
<p>必须以附加模式打开文件:</p>
<pre><code>fileobject = open('completed.txt', 'a')
</code></pre>
<p><a href="https://docs.python.org/2/tutorial/inputoutput.html#reading-and-writing-files" rel="nofollow">Python Docs for opening file</a></p>
<p>“处理文件对象时,最好使用with关键字。这样做的好处是,文件套件完成后会正确关闭,即使在执行过程中引发异常也是如此。它也比写等效的try finally块短得多。”</p>
<p>从<a href="https://docs.python.org/2/tutorial/inputoutput.html#methods-of-file-objects" rel="nofollow">Python docs</a></p>
<pre><code>with open('completed.txt', 'a') as fileobject:
fileobject.write(date + ' \n')
</code></pre>