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<h1><a href="http://wbowam.github.io/pythonbi-shi-ti.html"> Python笔试题 </a></h1>
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<h5 id="1">1. 什么是装饰器，使用场景是什么？最好能举例说明在你的项目中哪个地方用到过装饰器。<a class="headerlink" href="#1" title="Permanent link">¶</a></h5>
<p>答： 我们要对一个函数(myfunc)进行操作(修改或记录之类的)，如下</p>
<div class="highlight"><pre><span class="cp">#方法一：</span>
<span class="n">func</span> <span class="o">=</span> <span class="n">modify</span><span class="p">(</span><span class="n">myfunc</span><span class="p">)</span>
<span class="cp">#方法二：</span>
<span class="err">@</span><span class="n">modify</span>
<span class="n">def</span> <span class="n">myfunc</span><span class="p">()</span><span class="o">:</span>
<span class="n">pass</span>
</pre></div>
<p>方法一可行，但必须在myfunc已经被定义之后的某处，而且不通用，于是有了方法二：装饰器，使用情景如下：</p>
<p>例１：django中在某一操作前检查用户是否已登陆，如果未登录跳转到登陆页面．伪代码实现如下</p>
<div class="highlight"><pre><span class="n">def</span> <span class="n">login_required</span><span class="p">(</span><span class="n">func</span><span class="p">)</span><span class="o">:</span>
<span class="k">if</span><span class="p">(</span><span class="n">is_authenticated</span><span class="p">)</span><span class="o">:</span>
<span class="k">return</span> <span class="n">func</span><span class="p">()</span>
<span class="nl">else:</span>
<span class="k">return</span> <span class="n">login_view</span><span class="p">()</span>
<span class="err">@</span><span class="n">login_required</span>
<span class="n">def</span> <span class="n">article_detail</span><span class="p">(</span><span class="n">request</span><span class="p">)</span><span class="o">:</span>
<span class="n">user</span> <span class="o">=</span> <span class="n">request</span><span class="p">.</span><span class="n">user</span>
<span class="p">......</span>
<span class="k">return</span> <span class="n">render</span><span class="p">(</span><span class="s">"article_detail.html"</span><span class="p">,</span> <span class="n">context</span><span class="p">)</span>
<span class="err">@</span><span class="n">login_required</span>
<span class="n">def</span> <span class="n">article_index</span><span class="p">(</span><span class="n">request</span><span class="p">)</span><span class="o">:</span>
<span class="n">user</span> <span class="o">=</span> <span class="n">request</span><span class="p">.</span><span class="n">user</span>
<span class="p">......</span>
<span class="k">return</span> <span class="n">render</span><span class="p">(</span><span class="s">"article_index.html"</span><span class="p">,</span> <span class="n">context</span><span class="p">)</span>
</pre></div>
<p>例２：在django 中给Model自定义属性</p>
<div class="highlight"><pre><span class="n">from</span> <span class="n">django</span><span class="p">.</span><span class="n">db</span> <span class="n">import</span> <span class="n">models</span>
<span class="n">Class</span> <span class="n">Article</span><span class="p">(</span><span class="n">models</span><span class="p">.</span><span class="n">Model</span><span class="p">)</span><span class="o">:</span>
<span class="n">title</span> <span class="o">=</span> <span class="n">models</span><span class="p">.</span><span class="n">CharField</span><span class="p">(</span><span class="n">max_length</span><span class="o">=</span><span class="mi">1024</span><span class="p">)</span>
<span class="err">@</span><span class="n">property</span>
<span class="n">def</span> <span class="n">manifest</span><span class="p">(</span><span class="n">self</span><span class="p">)</span><span class="o">:</span>
<span class="n">attribute_key_list</span> <span class="o">=</span> <span class="p">[</span><span class="err">'</span><span class="n">id</span><span class="err">'</span><span class="p">,</span> <span class="err">'</span><span class="n">title</span><span class="err">'</span><span class="p">]</span>
<span class="n">entity_dict</span> <span class="o">=</span> <span class="p">{}</span>
<span class="k">for</span> <span class="n">key</span> <span class="n">in</span> <span class="n">attribute_key_list</span><span class="o">:</span>
<span class="n">entity_dict</span><span class="p">[</span><span class="n">key</span><span class="p">]</span> <span class="o">=</span> <span class="n">self</span><span class="p">.</span><span class="n">__getattribute__</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
<span class="k">return</span> <span class="n">entity_dict</span>
<span class="o">>>></span> <span class="n">article</span> <span class="o">=</span> <span class="n">Article</span><span class="p">(</span><span class="n">title</span><span class="o">=</span><span class="s">"Hackers and Painters"</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">article</span><span class="p">.</span><span class="n">save</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">article</span><span class="p">.</span><span class="n">manifest</span>
<span class="p">{</span><span class="err">'</span><span class="n">id</span><span class="err">'</span><span class="o">:</span> <span class="mi">1</span><span class="p">,</span> <span class="err">'</span><span class="n">title</span><span class="err">'</span><span class="o">:</span> <span class="s">"Hackers and Painters"</span><span class="p">}</span>
</pre></div>
<p>例３：python自带函数也到处使用装饰器，如</p>
<div class="highlight"><pre><span class="n">class</span> <span class="n">Foo</span><span class="o">:</span>
<span class="err">#静态方法走起</span>
<span class="err">@</span><span class="n">staticmethod</span>
<span class="n">def</span> <span class="n">add</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span><span class="o">:</span>
<span class="n">print</span> <span class="n">a</span> <span class="o">+</span> <span class="n">b</span>
</pre></div>
<h5 id="2">2. 什么是迭代器，使用场景是什么？最好能举例说明在你的项目中哪些地方用到过迭代器。<a class="headerlink" href="#2" title="Permanent link">¶</a></h5>
<p>答：常见的可迭代对象有list, dict,file, str......
只要是实现了next()或iter()方法的对象都可以迭代，如:</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="n">iterator</span> <span class="o">=</span> <span class="n">iter</span><span class="p">(</span><span class="n">range</span><span class="p">(</span><span class="mi">3</span><span class="p">))</span>
<span class="o">>>></span> <span class="n">iterator</span><span class="p">.</span><span class="n">next</span><span class="p">()</span>
<span class="mi">0</span>
<span class="o">>>></span> <span class="n">iterator</span><span class="p">.</span><span class="n">next</span><span class="p">()</span>
<span class="mi">1</span>
<span class="o">>>></span> <span class="n">iterator</span><span class="p">.</span><span class="n">next</span><span class="p">()</span>
<span class="mi">2</span>
<span class="o">>>></span> <span class="n">iterator</span><span class="p">.</span><span class="n">__iter__</span><span class="p">()</span>
<span class="o"><</span><span class="n">listiterator</span> <span class="n">at</span> <span class="mh">0x7fe6f25f11d0</span><span class="o">></span>
<span class="o">>>></span> <span class="k">for</span> <span class="n">i</span> <span class="n">in</span> <span class="n">iterator</span><span class="o">:</span>
<span class="n">print</span> <span class="n">i</span>
<span class="mi">0</span>
<span class="mi">1</span>
<span class="mi">2</span>
</pre></div>
<p><strong>迭代器</strong>: 访问集合内元素的一种方式．
1. 从第一个元素开始访问，一直到最后一个
2. 只往前访问(这并不算什么缺点，因为很少会有在迭代途中进行回退的操作)
3. 特别适合遍历巨大的文件或无限集合，如几个G的文件．因为它不要求你事先准备好整个迭代过程中所有的元素，仅仅在迭代至某个元素时才计算该元素．而列表是一次性获取所有值的，如果有很多值，列表会占用太多的内存．</p>
<h5 id="3-python">3. 请以代码说明你所理解的 Python 中对象的深拷贝和浅拷贝。<a class="headerlink" href="#3-python" title="Permanent link">¶</a></h5>
<p>答：深拷贝：对象与拷贝对象互相独立，其中任何一个对象的改动都不会对另外一个对象造成影响。</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="n">import</span> <span class="n">copy</span>
<span class="o">>>></span> <span class="n">old_obj</span> <span class="o">=</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">]</span>
<span class="o">>>></span> <span class="n">deep_obj</span> <span class="o">=</span> <span class="n">copy</span><span class="p">.</span><span class="n">deepcopy</span><span class="p">(</span><span class="n">old_obj</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">print</span> <span class="s">"old_obj:"</span><span class="p">,</span> <span class="n">old_obj</span><span class="p">,</span> <span class="s">"deep_obj:"</span><span class="p">,</span>
<span class="n">deep_obj</span>
<span class="nl">old_obj:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">]</span> <span class="n">deep_obj</span><span class="o">:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">]</span>
<span class="o">>>></span> <span class="n">deep_obj</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">old_obj</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">print</span> <span class="s">"old_obj:"</span><span class="p">,</span> <span class="n">old_obj</span><span class="p">,</span> <span class="s">"deep_obj:"</span><span class="p">,</span> <span class="n">deep_obj</span>
<span class="nl">old_obj:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">5</span><span class="p">]</span> <span class="n">deep_obj</span><span class="o">:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">]</span>
</pre></div>
<p>浅拷贝：对象与拷贝对象共用一份实体，仅仅是引用的变量不同</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="n">import</span> <span class="n">copy</span>
<span class="o">>>></span> <span class="n">old_obj</span> <span class="o">=</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">]</span>
<span class="o">>>></span> <span class="n">shallow_obj</span> <span class="o">=</span> <span class="n">old_obj</span><span class="err"> #也可以用</span> <span class="n">copy</span><span class="p">.</span><span class="n">copy</span><span class="p">(</span><span class="n">old_obj</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">print</span> <span class="s">"old_obj:"</span><span class="p">,</span> <span class="n">old_obj</span><span class="p">,</span> <span class="s">"shallow_obj:"</span><span class="p">,</span>
<span class="n">shallow_obj</span>
<span class="nl">old_obj:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">]</span> <span class="n">shallow_obj</span><span class="o">:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">]</span>
<span class="o">>>></span> <span class="n">shallow_obj</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">print</span> <span class="s">"old_obj:"</span><span class="p">,</span> <span class="n">old_obj</span><span class="p">,</span> <span class="s">"shallow_obj:"</span><span class="p">,</span> <span class="n">shallow_obj</span>
<span class="nl">old_obj:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">]</span> <span class="n">shallow_obj</span><span class="o">:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">]</span>
</pre></div>
<h5 id="3-python-web">3. 按熟悉程度说出你所接触过的 Python web 开发框架。<a class="headerlink" href="#3-python-web" title="Permanent link">¶</a></h5>
<p>答：Django, flask</p>
<h5 id="4-web">4. 请简单描述 web 开发框架大概有几个模块组成。<a class="headerlink" href="#4-web" title="Permanent link">¶</a></h5>
<p>答：Django
<em> <code>settings.py</code>：配置全域设定和全域参数
</em> <code>model</code>：处理和数据有关的所有事物
<em> <code>url</code>：设定网址的指向
</em> <code>views</code>：后端逻辑(url所设定的指向会指向到对应的view)
<em> <code>template</code>：网页模板
</em> <code>media</code>：存放影像或其他多媒体档案
* <code>static</code>：存放静态文件</p>
<p>django框架工作一般流程如下：
<img alt="流程图" src="http://2.bp.blogspot.com/_fzqQCMaRj_Q/SdRU9oQFWNI/AAAAAAAAAC8/Zfd0g8VmeC0/s1600/Django+-+010.jpg" /></p>
<div class="highlight"><pre> <span class="mf">1.</span> <span class="err">用户访问网址（指向到我们的</span><span class="n">django</span><span class="err">服务）</span>
<span class="mf">2.</span> <span class="err">从`</span><span class="n">urls</span><span class="p">.</span><span class="n">py</span><span class="err">`查出应指向哪个`</span><span class="n">app</span><span class="err">`哪个`</span><span class="n">view</span><span class="err">`</span>
<span class="mf">3.</span> <span class="err">若需要`</span><span class="n">view</span><span class="err">`读取数据库，做运算．并将运算结果与`</span><span class="n">tempplate</span><span class="err">`相结合</span>
<span class="mf">4.</span> <span class="err">将上一补的结果呈现给用户．</span>
</pre></div>
<ol>
<li>正则表达式中如何匹配数字？如果匹配单词？ 如何匹配行首和行尾？.*?+ 分别都代表什么？</li>
<li>
<p>请说一下你对正则中贪婪模式和非贪婪模式的理解。</p>
</li>
<li>
<p>爬取网页时遇到死链该怎么处理？</p>
</li>
<li>按熟悉程度写出你接触过的关系型数据库和 nosql。
答：关系型数据库：mysql，nosql:mongodb</li>
<li>你使用 linux 的频率有多高（桌面环境？开发环境？还是只是玩儿玩儿）
答：最近两年一直在用ubuntu．包括：平时使用14.04桌面版，写代码都在14.04 vps上，写博客及跑爬虫一般在vps docker里．</li>
<li>vim 使用：假设在一个文本中有 500 行文字，如果想把第200-300行中的 aaaa 替换成 bbbb 该怎么操作？
答：<code>:200,300s/aaaa/bbbb/g</code> </li>
<li>
<p>在 vim 中如何查看一个单词在文本中出现的次数？</p>
</li>
<li>
<p>你所熟悉的版本控制工具是什么？
答：git</p>
</li>
<li>描述一下你说理解的版本控制中的分支的概念。
答：<img alt="git branch" src="http://www.bootcss.com/p/git-guide/img/branches.png" />
分支用于将不同的开发绝缘开来．使用如下：</li>
<li>从主分支分离出开发分支;</li>
<li>在开发分支上进行开发;</li>
<li>将开发好的代码合并到主分支．
经典的分支管理策略由Vincent Driessen提出，图示如下：
<img alt="经典的分支结构" src="http://nvie.com/img/[email protected]" /></li>
<li>描述一下 pull request 开发流程。</li>
</ol>
<div class="highlight"><pre><span class="n">git</span> <span class="n">checkout</span> <span class="n">master</span> <span class="err">#切换到主分支</span>
<span class="n">git</span> <span class="n">pull</span> <span class="n">origin</span> <span class="n">master</span> <span class="err">#更新本地代码</span>
<span class="n">git</span> <span class="n">checkout</span> <span class="o">-</span><span class="n">b</span> <span class="n">feature</span><span class="o">-</span><span class="n">share</span><span class="o">-</span><span class="n">download</span> <span class="err">#新建并切换到功能分支</span>
<span class="p">....</span> <span class="err">#开发</span>
</pre></div>
<ol>
<li>描述一下你自己是如果组织一个项目的代码的。</li>
<li>
<p>说出你在 python 开发中常用的工具。</p>
</li>
<li>
<p>请写出你所熟悉或常用的遍历 字典 的方法。</p>
</li>
<li>假如有字符串 s = ‘I am a student’（每个单词以空格分隔），请写一段处理程序，处理后得到字符串 s1 = ‘student a am I’。如果第二个单词和第三个单词之间是两个空格分隔，第三个单词和第四个单词之间以 tab 分隔，怎么实现？</li>
<li>假如有一张用户数据表（十万行数据，字段为 id, name, ico），要取所有用户信息并打印，请用代码实现。</li>
</ol>
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<h4>Published</h4>
<time pubdate="pubdate" datetime="2015-04-26T00:00:00+08:00">Apr 26, 2015</time>
<h4>Category</h4>
<a class="category-link" href="/categories.html#IT-ref">IT</a>
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<li><a href="/tags.html#Python-ref">Python
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