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<h1><a href="http://wbowam.github.io/python-dai-ma-pian-duan.html"> Python 代码片段 </a></h1>
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<h4 id="python-logging">python logging<a class="headerlink" href="#python-logging" title="Permanent link">¶</a></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 id="python-get-line-num">python get line num<a class="headerlink" href="#python-get-line-num" title="Permanent link">¶</a></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 id="python">python 脚本基本结构<a class="headerlink" href="#python" title="Permanent link">¶</a></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 id="python-file">python file<a class="headerlink" href="#python-file" title="Permanent link">¶</a></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 id="python_1">python 正则<a class="headerlink" href="#python_1" title="Permanent link">¶</a></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 id="python-mp3">python 下载静态文件，如,mp3<a class="headerlink" href="#python-mp3" title="Permanent link">¶</a></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 id="pip">升级pip<a class="headerlink" href="#pip" title="Permanent link">¶</a></h4>
<p><code>easy_install -U pip</code> </p>
<h4 id="dir">dir()<a class="headerlink" href="#dir" title="Permanent link">¶</a></h4>
<ul>
<li>built-in function; </li>
<li>return a list of valid attributes for an object;</li>
<li>default: global objects</li>
</ul>
<h4 id="decode-encode">decode(), encode()<a class="headerlink" href="#decode-encode" title="Permanent link">¶</a></h4>
<p>decode的作用是将其他编码的字符串转换成unicode编码，如str1.decode('gb2312')，表示将gb2312编码的字符串str1转换成unicode编码。 </p>
<p>encode的作用是将unicode编码转换成其他编码的字符串，如str2.encode('gb2312')，表示将unicode编码的字符串str2转换成gb2312编码。 </p>
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<time pubdate="pubdate" datetime="2015-03-30T00:00:00+08:00">Mar 30, 2015</time>
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