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<h1><a href="/dai-ma-pian-duan.html"> 代码片段 </a></h1>
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<h4>python logging</h4>
<div class="highlight"><pre><span class="n">import</span> <span class="n">logging</span>
<span class="n">logging</span><span class="p">.</span><span class="n">basicConfig</span><span class="p">(</span><span class="n">filename</span> <span class="o">=</span> <span class="n">os</span><span class="p">.</span><span class="n">path</span><span class="p">.</span><span class="n">join</span><span class="p">(</span><span class="n">os</span><span class="p">.</span><span class="n">getcwd</span><span class="p">(),</span> <span class="err">'</span><span class="n">log</span><span class="p">.</span><span class="n">txt</span><span class="err">'</span><span class="p">),</span> <span class="n">level</span> <span class="o">=</span> <span class="n">logging</span><span class="p">.</span><span class="n">DEBUG</span><span class="p">)</span>
<span class="n">logging</span><span class="p">.</span><span class="n">debug</span><span class="p">(</span><span class="err">'</span><span class="n">this</span> <span class="n">is</span> <span class="n">a</span> <span class="n">message</span><span class="err">'</span><span class="p">)</span>
</pre></div>
<h4>python get line num</h4>
<div class="highlight"><pre><span class="n">f</span> <span class="o">=</span> <span class="n">open</span><span class="p">(</span><span class="s">"test.txt"</span><span class="p">)</span>
<span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">l</span> <span class="n">in</span> <span class="n">enumerate</span><span class="p">(</span><span class="n">f</span><span class="p">)</span><span class="o">:</span>
<span class="n">print</span> <span class="n">i</span>
</pre></div>
<h4>python 脚本基本结构</h4>
<div class="highlight"><pre><span class="n">import</span> <span class="n">sys</span>
<span class="n">source_file</span> <span class="o">=</span> <span class="n">sys</span><span class="p">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">"__main__"</span><span class="o">:</span>
<span class="n">my_func</span><span class="p">(</span><span class="n">source_file</span><span class="p">)</span>
</pre></div>
<h4>python file</h4>
<div class="highlight"><pre><span class="n">f</span> <span class="o">=</span> <span class="n">open</span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="s">"a"</span><span class="p">)</span> <span class="err">##</span> <span class="n">a</span> <span class="n">meaning</span> <span class="n">append</span>
<span class="n">f</span> <span class="o">=</span> <span class="n">open</span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="s">"w"</span><span class="p">)</span> <span class="err">##</span> <span class="n">w</span> <span class="n">meaning</span> <span class="n">write</span>
</pre></div>
<h4>python 正则</h4>
<div class="highlight"><pre><span class="n">import</span> <span class="n">re</span>
<span class="n">pattern</span> <span class="o">=</span> <span class="n">re</span><span class="p">.</span><span class="n">compile</span><span class="p">(</span><span class="s">"[a-zA-Z]"</span><span class="p">)</span>
<span class="n">result</span> <span class="o">=</span> <span class="n">pattern</span><span class="p">.</span><span class="n">search</span><span class="p">(</span><span class="s">"adsfuhefdfkj435"</span><span class="p">)</span>
<span class="n">print</span> <span class="n">result</span><span class="p">.</span><span class="n">group</span><span class="p">()</span>
</pre></div>
<h4>python 下载静态文件，如,mp3</h4>
<div class="highlight"><pre><span class="n">import</span> <span class="n">urllib</span>
<span class="n">urllib</span><span class="p">.</span><span class="n">urlretrieve</span><span class="p">(</span><span class="n">audio_url</span><span class="p">,</span> <span class="s">"name.mp3"</span><span class="p">)</span>
</pre></div>
<h4>升级pip</h4>
<p><code>easy_install -U pip</code> </p>
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<h4>Published</h4>
<time pubdate="pubdate" datetime="2015-03-30T00:00:00+08:00">Mar 30, 2015</time>
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