title: How to display Chinese in matplotlib plot
body: <p>Here, I have a plot work to do with pandas, like this :</p>
  <pre><code>most_active_posts.plot(x = 'title',y = 'active_span',kind = 'barh')
  </code></pre>
  <p><code>most_active_posts</code> is an object of dataframe with index, I want a simple two-dimensional plot with two columns, one is <code>'title'</code> and the other is <code>'active_span'</code>.</p>
  <p><code>title</code> is type of string, which contains Chinese characters, while <code>active_span</code> is type of integer .</p>
  <p>How can I display Chinese characters normally?</p>