title: Why am I getting 'float' object is unsliceable
body: <p>I am getting an error 'float' object is unsliceable
  only when I use the terminal.
  when I use the Pycharm it works perfectly.</p>
  <p>basically I am trying to convert the following float
  <strong>'1.215386e+11'</strong>
  into datetime format using the following line:</p>
  <pre><code>df3[&quot;FrameTime&quot;] = pd.to_datetime(df3[&quot;FrameTime&quot;], format='%H%M%S%f')
  </code></pre>
  <p>This returns the following error with Terminal using Ubuntu 18.04 :
  <strong>'float' object is unsliceable</strong></p>
  <p>Thanks in advance for your help.</p>