title: Python skip empty cells
body: <p>I want to be able to search through my dataframe and skip cells that are blank. However, when i read in the DF it reads the blanks as &quot;nan&quot;</p>
  <p>DF1</p>
  <pre><code>Name Address1 Street      Town   Postcode
  Will nan      nan        London   nan
  Phil 19      Long Road     nan    nan
  </code></pre>
  <p>I want to be able to filter through Address1, Street and Town. If there is text inside of those columns I want to add a &quot;|&quot; at the start but if there is no text inside of the column it skips that cell and doesn't add the &quot;|&quot;</p>
  <p>Desired Result</p>
  <pre><code>Name Address1 Street      Town   Postcode
  Will                     |London 
  Phil 19      |Long Road
  </code></pre>