title: Conda install screwed up my environment. Can I undo it?
body: <p>I tried installing rpy2 so that I could work with R files (<code>.rda</code>) using <code>conda install -c r rpy2</code>, and it totally screwed up my environment. </p>
  
  <p>For example:</p>
  
  <p>1) When I try importing <strong>pandas</strong>, I get this error: <code>AttributeError: module 'pandas' has no attribute 'core'</code></p>
  
  <p>2) When I try importing <strong>matplotlib</strong>, I get this error: <code>AttributeError: module 'matplotlib' has no attribute 'artist'</code></p>
  
  <p>I wasn't having these issues before I installed this package. Is there a way to undo what I just did  - as if I never installed it in the first place?</p>