title: Python 3, module 'itertools' has no attribute 'ifilter'
body: <p>I am new at Python, trying to build an old python file into Python 3. I got several build errors which I solved. But at this point I am getting above error. I have no idea how to fix this. The code section looks like below.</p>
  
  <pre><code>return itertools.ifilter(lambda i: i.state == "IS", self.storage)
  </code></pre>