title: Autocompletion in a Jupyter Notebook when chaining methods
body: <p>In a Python 3 Jupyter Notebook the TAB autocompletion feature works only for the first method called on an object. For all subsequent method the TAB key is not working.
  I often use methods chaining and therefore the autocompletion doesn't work most of time for me.</p>
  
  <p>I tried to install nbextensions and played a little with Hinterland but apparently it's not helpfull with my problem</p>
  
  <p>For example:</p>
  
  <pre><code>import pandas as pd
  
  df_ex = pd.DataFrame({
      "City": ['Cincinati', 'Milwaukee', 'Philadelphie', 'Chicago', 'Phoenix'],
      "Size": [500.15, 600.25, 700.50, 800.05, 900.9],
      "Score": [10, 20, 30, 40, 50]})
  
  df_ex.get_dtype_counts().sum()
  </code></pre>
  
  <p>Here the TAB autocompletion will work only for the get_dtype_counts() method but will not work for the sum() method</p>
  
  <p>As a Python beginner, autocompletion is also usefull for me to know what are all the methods that can be called at a certain point.
  Is there a way to make the autocompletion work or at least to get the list of the methods (and attributes) that I can call after I already called a first method on an object.</p>