title: Copy upper triangle to lower triangle in a python matrix
body: <pre><code>       iluropoda_melanoleuca  bos_taurus  callithrix_jacchus  canis_familiaris
  ailuropoda_melanoleuca     0        84.6                97.4                44
  bos_taurus                 0           0                97.4              84.6
  callithrix_jacchus         0           0                   0              97.4
  canis_familiaris           0           0                   0                 0
  </code></pre>
  
  <p>This is a short version of the python matrix I have. I have the information in the upper triangle. Is there an easy function to copy the upper triangle to the down triangle of the matrix?</p>