title: How to concatenate all (string) values in a given pandas dataframe row to one string?
body: <p>I have a pandas dataframe that looks like this:</p>
  
  <pre><code>     0        1            2        3       4
  0    I        want         to       join    strings  
  1    But      only         in       row     1
  </code></pre>
  
  <p>The desired output should look like this:</p>
  
  <pre><code>     0        1      2        3       4       5
  1    But      only   in       row     1       I want to join strings
  </code></pre>
  
  <p><strong>How to concatenate those strings to a joint string?</strong></p>