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<!DOCTYPE html>
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<title>philokey的笔记</title>
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<a href="./pages/2014/08/13/python-ke-bian-dui-xiang-he-bu-ke-bian-dui-xiang.html"><h2>python 可变对象和不可变对象</h2></a>
<div class= "well small"> 2014-08-13
by <a class="url fn" href="./author/philokey.html">philokey</a>
</div>
<div class="summary"><p>Python中没有变量，只有对象和名字。万物皆对象。
每个对象都包含一一个标准头,通过头部信息就可以明确知道其具体类型。
头信息由 "引用用计数" 和 "类型指针"组成,前者在对象被引用用时增加,超出作用用域或手工释放后减小,等于 0 时会被虚拟机回收 (某些被缓存的对象计数器永远不会为 0)。用 </p>
<div class="highlight"><pre>sys.getrefcount(name)
</pre></div>
<p>可以对象查看被引用次数</p>
<p>Python在heap中分配的对象分成两类：可变对象和不可变对象。所谓可变对象是指，对象的内容是可变的，例如list。而不可变的对象则相反，表示其内容不可变。</p>
<ul>
<li>不可变对象：int，string，float，tuple</li>
<li>可变对象 ：list，dictionary</li>
</ul>
<h2>不可变对象</h2>
<p>对于不可变对象，尽管对象本身不可变，但名字的对象引用是可变的。</p>
<div class="highlight"><pre>>>> a = 1005
>>> a = 1006 #1005的引用减1, 1006的引用加1,或者是创建的新的对象1006
#不可变对象字符串
>>> str ...</pre></div> <a class="btn btn-info xsmall" href="./pages/2014/08/13/python-ke-bian-dui-xiang-he-bu-ke-bian-dui-xiang.html">read more</a></div>
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<a href="./pages/2014/08/10/stlbi-ji.html"><h2>STL笔记</h2></a>
<div class= "well small"> 2014-08-10
by <a class="url fn" href="./author/philokey.html">philokey</a>
</div>
<div class="summary"><h2>priority_queue自定义比较函数</h2>
<p>模板声明带有三个参数</p>
<div class="highlight"><pre>priority_queue<Type, Container, Functional>
</pre></div>
<p>Type 为数据类型， Container 为保存数据的容器，Functional 为元素比较方式。
Container 必须是用数组实现的容器，比如 vector, deque 但不能用 list.
STL里面默认用的是 vector. 比较方式默认用 operator< , 所以默认为小根堆。</p>
<div class="highlight"><pre><span class="cp">#include < iostream ></span>
<span class="cp">#include < queue ></span>
<span class="cp">#include < functional ></span>
<span class="k">using</span> <span class="k">namespace</span> <span class="n">std</span><span class="p">;</span>
<span class="k">class</span> <span class="nc">cmp</span> <span class="p">{</span>
<span class="k">public</span><span class="o">:</span>
<span class="kt">bool</span> <span class="k">operator</span><span class="p">()</span> <span class="p">(</span><span class="k">const</span> <span class="kt">int</span><span class="o">&</span> <span class="n">a</span><span class="p">,</span> <span class="k">const</span> <span class="kt">int</span><span class="o">&</span> <span class="n">b</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">a</span> <span class="o">></span> <span class="n">b</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">};</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
<span class="n">priority_queue ...</span></pre></div> <a class="btn btn-info xsmall" href="./pages/2014/08/10/stlbi-ji.html">read more</a></div>
</div>
<div class='article'>
<a href="./pages/2014/08/01/bo-ke-da-jian-ji-lu.html"><h2>博客搭建记录</h2></a>
<div class= "well small"> 2014-08-01
by <a class="url fn" href="./author/philokey.html">philokey</a>
</div>
<div class="summary"><p>厌倦了一次又一次去搜相同问题的答案，写个博客把一些东西记录下来吧。
出于黑客精神，决定自己搭建博客。</p>
<p>Wordpress过于庞大，而且我不会PHP，所以选择了基于python的pelican。
由于github有免费的300M空间，所以博客托管再github上。github还有一个好处就是对markdown的支持不错。</p>
<p>不用数据库，全部都以可见文本形式存储，携带迁移，好开心~</p>
<p>2015.11.29 update</p>
<p>谢天谢地有这篇搭建笔记，重新把博客搭起来并迁移到了Python3，真感人。</p>
<h2>本地配置Pelican</h2>
<h3>安装pelican和markdown</h3>
<div class="highlight"><pre>pip install pelican
pip install markdown
</pre></div>
<h3>启动工程</h3>
<div class="highlight"><pre>pelican-quickstart
</pre></div>
<p>目录树如下</p>
<div class="highlight"><pre>├── content #存放.mdn文件
├── develop_server.sh #方便开启测试服务器
├── fabfile.py #配置文件
├── Makefile #方便管理博客的Makefile
├── output #生成的输出文件
├── pelicanconf.py #主配置文件
└── publishconf.py ...</pre></div> <a class="btn btn-info xsmall" href="./pages/2014/08/01/bo-ke-da-jian-ji-lu.html">read more</a></div>
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<a href="./pages/2014/08/01/hello-world.html"><h2>hello world</h2></a>
<div class= "well small"> 2014-08-01
by <a class="url fn" href="./author/philokey.html">philokey</a>
</div>
<div class="summary"><h3>Hello World</h3>
<div class="highlight"><pre><span class="cp">#include <cstdio></span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
<span class="n">printf</span><span class="p">(</span><span class="s">"Hello World</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
<p><img alt="测试图片" src="https://lh4.googleusercontent.com/-mPNwHFX9qac/UQOGgQHjkcI/AAAAAAAAABA/YU7VaS0I2fs/s149/1131410.png" /></p> <a class="btn btn-info xsmall" href="./pages/2014/08/01/hello-world.html">read more</a></div>
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