title: Iterating over columns with index
body: <p>How I can iterate over columns with index in pandas, for rows we can use <code>for i, j in df.iterrows():</code> which will give the index and the row.</p>
  
  <p>Is there anything similar for columns?   </p>
  
  <pre><code>spice smice skice bike dike mike 
      1     23     35    34   34   56 
      135   34     23    21   56   34
      231   12     67    21   62   75
  </code></pre>
  
  <p>I am trying to use a nested for loop like the following:</p>
  
  <pre><code>for index, col1 in  df.columns:
    for col2 in df.columns[index:]:
  </code></pre>
  
  <p>Is there any better way of doing this?</p>