title: Python return result is not alike "N()"
body: <p>I made the method name is slide. and it must return the reference of it. Then, What should I do?.</p>
  <p>First, I made this function like:</p>
  <pre><code>class N:
    def slide(self, i):
      #do something
      return self
  </code></pre>
  <p>This slide method must return &quot;N()&quot; but &quot;&lt;~~ obejct at x0000&gt;&quot;</p>