title: How to create a Pandas dataframe column based on names from another column?
body: <p>In a Pandas dataframe (say <code>df</code>), I have the following column:</p>
  <pre><code>       company_id 
      1    QW5kcm9z 
      2    QXNzb2Np 
      3        QmVs 
      4    RGFub25l 
      5    RWNvdG9u 
      6    RmVycmVy 
      7    R2VuZXJh 
      8    SGVybw== 
      9    S2VsbG9n 
      10   TWFycw== 
      ...  ...
  </code></pre>
  <p>I'd like to create another colmun based on this column with &quot;./Pics/&quot; at the beginning and &quot;.png&quot; at the end, so the first value would be: <code>./Pics/QW5kcm9z.png</code></p>