title: reticulate ImportError: No module named pandas in Rstudio version 1.2
body: <p>I am trying to use the reticulate package in a Rmd file. I first created a setup chunk as follows:</p>
  
  <pre><code>library(reticulate)
  use_virtualenv("r-reticulate")
  use_python("C:\\Python27")
  </code></pre>
  
  <p>Then I import <code>pandas</code>:  </p>
  
  <pre><code>#importing libraries
  import pandas 
  </code></pre>
  
  <pre><code> ImportError: No module named pandas
  
  Detailed traceback: 
    File "&lt;string&gt;", line 1, in &lt;module&gt;  
  </code></pre>
  
  <p>I have checked that pandas is already installed from the python command line. Why am I getting an import error here?</p>