如何利用python登录知乎页面？

<span class="kn">import</span> <span class="nn">requests</span>
<span class="kn">from</span> <span class="nn">bs4</span> <span class="kn">import</span> <span class="n">BeautifulSoup</span>

<span class="n">s</span> <span class="o">=</span> <span class="n">requests</span><span class="o">.</span><span class="n">Session</span><span class="p">()</span>
<span class="n">r</span> <span class="o">=</span> <span class="n">s</span><span class="o">.</span><span class="n">post</span><span class="p">(</span><span class="s">'http://www.zhihu.com/login'</span><span class="p">,</span>
           <span class="n">data</span><span class="o">=</span><span class="p">{</span><span class="s">'_xsrf'</span><span class="p">:</span> <span class="n">BeautifulSoup</span><span class="p">(</span><span class="n">s</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s">'http://www.zhihu.com/'</span><span class="p">)</span><span class="o">.</span><span class="n">content</span><span class="p">)</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="nb">type</span><span class="o">=</span><span class="s">'hidden'</span><span class="p">)[</span><span class="s">'value'</span><span class="p">],</span>
                 <span class="s">'email'</span><span class="p">:</span> <span class="s">'email'</span><span class="p">,</span> <span class="s">'password'</span><span class="p">:</span> <span class="s">'password'</span><span class="p">,</span> <span class="s">'rememberme'</span><span class="p">:</span> <span class="s">'y'</span><span class="p">})</span>
<span class="k">print</span><span class="p">(</span><span class="n">r</span><span class="o">.</span><span class="n">text</span><span class="p">)</span>