title: How to add strings as a new column to Pandas Dataframe?
body: <p>Let say I have a dataframe, 3 rows, index and 1 column and separate 3 strings. How can I add those strings as a 2nd column to existing dataframe?</p>
  
  <p>I have:
  dataframe and 3 strings</p>
  
  <pre><code>1 Qwe
  2 Asd
  3 Zxc
  
  s1 = Poi; s2 = Lkj; s3 = Mnb
  </code></pre>
  
  <p>I want:</p>
  
  <pre><code>1 Qwe Poi
  2 Asd Lkj
  3 Zxc Mnb
  </code></pre>
  
  <p>Any suggestions?</p>