title: I want to use pandas2ri in JUPYTER but tzlocal issue?
body: <p>Everytime I try to import the pandas2ri in jupyter, python interface: </p>
  
  <pre><code>from rpy2.robjects import pandas2ri
  </code></pre>
  
  <p>I get the following error: </p>
  
  <pre><code>ModuleNotFoundError                       Traceback (most recent call last)
  &lt;ipython-input-28-cc52694d111a&gt; in &lt;module&gt;()
  ----&gt; 1 from rpy2.robjects import pandas2ri
  
  /Users/sondosayyash/anaconda/lib/python3.6/site-packages/rpy2/robjects/pandas2ri.py in &lt;module&gt;()
       21 import numpy
       22 import pytz
  ---&gt; 23 import tzlocal
       24 import warnings
       25 
  
  ModuleNotFoundError: No module named 'tzlocal'
  </code></pre>
  
  <p>I tried to use </p>
  
  <pre><code>from dateutil.tz import tzlocal 
  </code></pre>
  
  <p>but that didn't seem to fix the issue. </p>
  
  <p>I've already installed tzlocal and it is on my computer.  When I import pandas2ri on ipython, there is no problem.. the problem only occurs when calling in the jupyter environment.  </p>
  
  <p>this is the message I get when I try to install tzlocal again:</p>
  
  <pre><code>DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. 
  
  Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.
  Requirement already satisfied: tzlocal in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (1.5.1)
  Requirement already satisfied: pytz in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from tzlocal) (2017.2)
  </code></pre>