title: Convert values in pandas dataframe to two decimal points
body: <p>I have a pandas dataframe as follows.</p>
  
  <pre><code>     NO                Topic A                   Topic B            Topic C
  0    0.0                1.000                      1.000            1.000   
  1    1.0                0.550                      0.640            0.550   
  2    2.0                0.567                      0.740            0.675   
  3    3.0                0.850                      0.860            0.850   
  4    4.0                0.200                      0.200            0.200   
  5    5.0                0.850                      0.840            0.850   
  6    6.0                0.450                      0.533            0.450   
  7    7.0                0.625                      0.657            0.700   
  8    8.0                0.575                      0.500            0.575   
  9    9.0                0.850                      0.900            0.880   
  10  10.0                0.950                      0.971            0.960
  </code></pre>
  
  <p>Now I want to update the entire dataframe in a way it contains values of two decimal ponits. e.g., 0.625 -> 0.63 etc.</p>
  
  <p>Is it possible to do it in pandas?</p>