title: Slice pandas multiindex dataframe using list of index values
body: <p>I have a multi-index dataframe that looks like</p>
  
  <p>uid tid text</p>
  
  <p>abc x   t1</p>
  
  <p>bcd y   t2</p>
  
  <p><em>uid</em> and <em>tid</em> are the indexes. I have a list of <em>uid</em>s, and want to get the rows corresponding to the <em>uids</em> in that list, but keeping the 2nd level index values (tid). I want to do it without running any explicit loop. Is that possible?</p>