title: Random graph generator
body: <p>I am interested in generating weighted, directed random graphs with node constraints. Is there a graph generator in R or Python that is customizable? The only one I am aware of is igraph's <code>erdos.renyi.game()</code> but I am unsure if one can customize it. </p>
  
  <p>Edit: the customizations I want to make are 1) drawing a weighted graph and 2) constraining some nodes from drawing edges. </p>