title: python - Convert float into integer in a column pandas
body: <p>I have a pandas dataframe as:</p>
  
  <pre><code>df3 = pd.DataFrame({
  'T': [11.0,22.0,11.23,20.03],
  'v2': [11.0,13.0,55.1,33.0],
  'v3' : [112.1,2.0,2.1,366.0],
  'v4': [np.nan, "blue", 1.0, 2.0]
   })
  
         T    v2     v3    v4
  0  11.00  11.0  112.1   NaN
  1  22.00  13.0    2.0  blue
  2  11.23  55.1    2.1   1.0
  3  20.03  33.0  366.0   2.0
  </code></pre>
  
  <p>and I must have:</p>
  
  <pre><code>    T       v2     v3    v4
  0  11     11.0  112.1   NaN
  1  22     13.0    2.0  blue
  2  11.23  55.1    2.1   1.0
  3  20.03  33.0  366.0   2.0
  </code></pre>
  
  <p>So I have to transform float to integer only on 'T.'</p>