title: How to reset Pandas DataFrame indices?
body: <p>all,</p>
  
  <p>I have (what should be) a very simple Pandas question.  I'm trying to "refresh" the indices of my DataFrame, df.
  I'm trying:</p>
  
  <pre><code>df3 = df2.reindex()
  df3.head()
  </code></pre>
  
  <p>But this still gives me:</p>
  
  <pre><code>        Dose
  13539.0 1.0
  13539.0 2.0
  13539.0 5.0
  13539.0 3.0
  13539.0 4.0
  </code></pre>
  
  <p>I need to keep the "Dose" column in the same order, but make its indices 0 -> len(Dose).</p>
  
  <p>In other words, <strong>my desired output is:</strong></p>
  
  <pre><code>    Dose
  0   1.0
  1   2.0
  2   5.0
  3   3.0
  4   4.0
  </code></pre>
  
  <p>Clearly I've pre-processed something to mess this up, but I'd appreciate any insight as to how I can ammend it :-)</p>
  
  <p>Thank you!!</p>