title: While finding eulidean distance, I get TypeError: unsupported operand type(s) for -: 'list' and 'list'
body: <p>I get an error: TypeError: unsupported operand type(s) for -: 'list' and 'list'
  while finding Euclidean Distance of my chromosomes. Here is my code:</p>
  
  <pre><code>organisms=[canis_lupus,Drosophila_melanogaster,Felis_catus,Homo_sapiens,Mus_musculus]
  
  def euclidean_distance(p,q):
     distance = np.linalg.norm(p-q)
     return distance
  
  edistance = []
  for i in range(len(organisms)):
    for j in range(i+1,len(organisms)):
       edistance.append(euclidean_distance(organisms[i],organisms[j]))
  
  print(edistance) 
  </code></pre>
  
  <p>Please note that if I print organisms, each element is basically a list of length 256.</p>