title: DataFrame Pandas shows NAN
body: <p>I have hdf5 and I have moved to DataFrame, but problem is when I want to plot, nothing shows on the graph. And I have checked new dataframe, but I saw, there was nothing.
  This is my DF (
  <a href="https://i.stack.imgur.com/Fgpyg.png" rel="nofollow noreferrer">I don't allowed to post pics, so please click to the link</a> )</p>
  
  <pre><code>df1 = pd.DataFrame(df.Price, index = df.Timestamp)
  plt.figure()
  df1.plot()
  plt.show()
  </code></pre>
  
  <p>Second DF shows NAN in price column. Whats wrong?</p>