title: matplotlib lib throws an attribution error : module 'matplotlib.rcsetup' has no attribute '_validators'
body: <p>Recently I updated matplot lib version to 2.1.0 as per the requirement. After the execution of code it throws an error :</p>
  <pre><code>AttributeError: module 'matplotlib.rcsetup' has no attribute '_validators'
  </code></pre>
  <p>I have tried uninstalling and installing matplotlib. I used both cmd and conda to do the installation one at a time.</p>
  <p>Please help me out in this.
  For any valuable suggestion TIA.</p>
  <p>PFA screenshot of an error:</p>
  <p><a href="https://i.stack.imgur.com/kYFEk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kYFEk.png" alt="enter image description here" /></a></p>
  <p>PS : I dont want to remove python as in whole and install libs again.</p>