title: No definition found for pandas in VS Code
body: <p>VS Code 1.41.1</p>
  
  <p>python3-pandas 0.23.3</p>
  
  <p>Debian buster (10)</p>
  
  <p>I cannot get definitions of pandas functions in VS Code. Definitions for all other python3 packages are available though. Here is a MWE:</p>
  
  <pre><code>import pandas
  import quandl
  df = quandl.get("WIKI/GOOGL")
  df.fillna(value=-99999, inplace=True)
  </code></pre>
  
  <p>The definition for quandl.get() is available but not the one for df.fillna(). Definitions for functions and classes of other python3 modules are available as well. BTW pandas-doc is not available with pip and pip3 but I have it installed from the python repositories (python-pandas-doc). Any idea how this can be fixed?</p>