title: Is there a pandas equivalent of dplyr::summarise?
body: <p>In R/dplyr, I can do</p>
  
  <pre><code>summarise(iris, max_width=max(Sepal.Width), min_width=min(Sepal.Width))
  </code></pre>
  
  <p>and get:</p>
  
  <pre><code>  max_width min_width
  1       4.4         2
  </code></pre>
  
  <p>Is there something similar to <code>summarise</code> in pandas? I know <code>describe()</code>, but I would like the result to only contain a given summary statistic for a given column, not all summary statistics for all columns. In pandas, <code>iris.describe()</code> gives:</p>
  
  <pre><code>        sepal_length  sepal_width  petal_length  petal_width
  count    150.000000   150.000000    150.000000   150.000000
  mean       5.843333     3.057333      3.758000     1.199333
  std        0.828066     0.435866      1.765298     0.762238
  min        4.300000     2.000000      1.000000     0.100000
  25%        5.100000     2.800000      1.600000     0.300000
  50%        5.800000     3.000000      4.350000     1.300000
  75%        6.400000     3.300000      5.100000     1.800000
  max        7.900000     4.400000      6.900000     2.500000
  </code></pre>