title: 'TypeError: 'list' object is not callable' in ARIMA
body: <p>I am trying to launch a Python code for ARIMA prediction, but I have a problem with the following two lines</p>
  
  <pre><code>p = d = q = range(0, 2)
  pdq = list(itertools.product(p, d, q))
  </code></pre>
  
  <p>When I run these basic two lines, the output is </p>
  
  <pre><code>TypeError: 'list' object is not callable
  </code></pre>
  
  <p>What's the issue?</p>