擅长:python、mysql、java
<p><code>u''</code>在python<a href="https://docs.python.org/2/tutorial/introduction.html#unicode-strings" rel="nofollow noreferrer">Unicode Strings</a>中定义Unicode字符串。你知道吗</p>
<p><code>'\n'</code>是一个转义序列,代表<a href="http://python-reference.readthedocs.io/en/latest/docs/str/escapes.html" rel="nofollow noreferrer">Linefeed</a>。换行是指将打印区域前进一行。你知道吗</p>