title: How do I loop across a correlation matrix to only give me pairs of correlations above a certain threshold? And/or make it more efficient
body: <p>I've got the following code:</p>
  
  <pre><code>for i in list(corr.columns):
      for j in list(corr.columns):
          if corr.ix[i,j]&gt;0.7 and corr.ix[i,j] != 1:
              print i, ' ',j ,' ', corr.ix[i,j] 
  </code></pre>
  
  <p>The problem is that whilst this works, it returns both corr[i,j] and corr[j,i] as if they were different correlations. 
  Is there anyway I could just loop through just the 'bottom triangle' of the correlation matrix?</p>