title: Getting TypeError: 'list' object is not callable when setting index in Pandas Dataframe
body: <p>I have simple Pandas Dataframe:</p>
  
  <pre><code>data.head(5)
  
  
  &gt; Date  Time    Open    High    Low Close   Vol OI
  &gt; 0 02/02/1993  16:00   44.23   44.38   44.13   44.34   201300  0
  &gt; 1 02/03/1993  16:00   44.41   44.84   44.38   44.82   529400  0
  &gt; 2 02/04/1993  16:00   44.97   45.10   44.88   45.00   531500  0
  &gt; 3 02/05/1993  16:00   44.97   45.06   44.73   44.97   492100  0
  &gt; 4 02/08/1993  16:00   44.97   45.13   44.92   44.98   596100  0
  </code></pre>
  
  <p>I want to set Column "Date" as index:</p>
  
  <pre><code>data.set_index('Date')
  </code></pre>
  
  <p>But get error "TypeError: 'list' object is not callable"</p>
  
  <pre><code>TypeError                                 Traceback (most recent call last)
  &lt;ipython-input-59-a610da45b82c&gt; in &lt;module&gt;()
  ----&gt; 1 data.set_index('Date')
  
  TypeError: 'list' object is not callable
  </code></pre>
  
  <p>Currently the index in data is RangeIndex:</p>
  
  <pre><code>data.index
  RangeIndex(start=0, stop=5873, step=1)
  </code></pre>
  
  <p>Any tip why I cannot set the index using Date column?</p>
  
  <p>Thank you.</p>