title: No module named 'rpytools'?
body: <p>I'm trying to work with the reticulate library in R. I used the "functions.py" example to test it out:</p>
  
  <pre><code># functions.py file
  def add(x, y): 
      return x + y
  </code></pre>
  
  <p>In R studio (Version 3.5.2), this is what I have:</p>
  
  <pre><code>library(reticulate)  
  source_python('functions.py')
  </code></pre>
  
  <p>However, this returns an error:</p>
  
  <pre><code>Error in py_set_attr_impl(x, name, value) : 
    Evaluation error: ModuleNotFoundError: No module named 'rpytools'.
  </code></pre>
  
  <p>So I'm stuck here. If it helps, I'll also share that my Python is 64-bit and version 3.6.5. Anyone know how to go about this?</p>
  
  <p>Thanks</p>