title: Selecting Pandas Columns by dtype
body: <p>I was wondering if there is an elegant and shorthand way in Pandas DataFrames to select columns by data type (dtype). i.e. Select only int64 columns from a DataFrame.</p>
  
  <p>To elaborate, something along the lines of</p>
  
  <pre><code>df.select_columns(dtype=float64)
  </code></pre>
  
  <p>Thanks in advance for the help</p>