title: ImportError: Missing required dependencies ['pytz'] after install
body: <p>I am receiving this error when I run pandas:</p>
  
  <pre><code>File "C:\Python27\lib\site-packages\pandas\__init__.py", line 19, in &lt;module&gt;
  "Missing required dependencies {0}".format(missing_dependencies))
  ImportError: Missing required dependencies ['pytz']
  </code></pre>
  
  <p>All was fine until after I installed <code>numpy‑1.14.1+mkl‑cp27‑cp27m‑win32.whl</code>. 
  I uninstalled <code>pandas</code> and <code>numpy</code> and tried reinstalling. That didn't work.</p>
  
  <p>My environment variables is set to the <code>"C:\Python27"</code>. <code>C:\Python27\Lib\site-packages</code> does have <code>pytz</code>. </p>
  
  <p>I've also tried <code>easy_install pytz</code> and gave me <code>already satisfied</code>. 
  Is there a way I can revert back to where I was before I installed numpy+mkl or fix this error?</p>
  
  <p>Thank you very much!</p>