title: Python: pd.read_csv - import all numbers after the decimal
body: <p>In my csv file that I wish to import, I have a column <code>Timestamp</code> with nanoseconds precision:
  34200.154875632 and so on.</p>
  
  <p>When I write:</p>
  
  <pre><code>dfr = pd.read_csv(files,index_col=None,usecols=['Timestamp','Price'], header=0,dtype=np.float)  
  df=DataFrame(dfr)
  </code></pre>
  
  <p>I do not get a <code>DataFrame</code> with a column of <code>Timestamp</code> with all nice decimals...only six. I tried to play around with the input <code>dtype=np.float</code> but no result. What's the missing argument in <code>pd.read_csv</code> to have all nine decimals?</p>