title: Setting 1 or 0 to new Pandas column conditionally
body: <p>A pretty straightforward pandas question:</p>
  
  <p>If I have a dataframe as such:</p>
  
  <pre><code>   hour
   0  0
   1  1
   2  1
   3  2
   4  2
    ...
  </code></pre>
  
  <p>and I'd like to create a new column 'lunch' that'll have the value 1 if 11&lt;=hour&lt;=1 and 0 otherwise, what's the best and computationally quickest way to do this?</p>