title: How to read in weighted edgelist with igraph in Python (not in R)?
body: <p>What I aim to do is create a graph of the nodes in the first 2 columns, that have edge lengths that are proportional to the values in the 3rd column.  My input data looks like:</p>
  
  <pre><code>E06.1644.1  A01.908.1   0.5
  E06.1643.1  A01.908.1   0.02 
  E06.1644.1  A01.2060.1  0.7
  </code></pre>
  
  <p>I am currently importing it like this:</p>
  
  <pre><code>g=Graph.Read_Ncol("igraph.test.txt",names=True,directed=False,weights=True)
  igraph.plot(g, "igraph.pdf", layout="kamada_kawai")
  </code></pre>
  
  <p>When I print the names or the weights (which I intend them to be the edge lengths), they print out fine with:</p>
  
  <pre><code>print(g.vs["name"])
  print(g.es["weight"])
  </code></pre>
  
  <p>However, the vertices are blank, and the lengths do not seem to be proportional to their values.  Also, there are too many nodes (A01.908.1 is duplicated).
  What am I doing wrong?
  Thanks in advance....</p>