title: Pandas Dataframe - Replace column values with reciprocal
body: <p>My dataframe looks like follows</p>
  
  <pre><code>           0     1         2         3         4
             0   0.660377  0.75  0.728395  1.000000  0.011364
             1   0.452830  0.50  0.629630  0.083333  0.045455
             2   0.971698  0.75  0.975309  0.166667  0.079545
             3   0.169811  0.25  0.172840  0.291667  0.068182
             4   0.216981  0.25  0.222222  0.000000  0.090909
             5   0.669811  0.50  0.839506  0.333333  0.045455
  </code></pre>
  
  <p>I need to replace first column with its reciprocal values. Is there any built-in way to do that in Pandas?</p>