title: Remove nodes with mouse click, networkX, python 2.7
body: <p>I have written a program in Python 2.7 with networkX which draws a tree with black and white nodes. Here is a minimal example:</p>
  
  <pre><code>import networkx as nx
  import matplotlib.pyplot as plt
  import numpy
  
  T = nx.Graph()
  
  ### Nodes
  white, black = [1, 4, 5, 6, 7], [2, 3]
  allNodes = white+black
  
  for node in allNodes:      T.add_node(node)
  
  ### Edges
  T.add_edge(1, 2)
  T.add_edge(1, 3)
  T.add_edge(2, 4)
  T.add_edge(2, 5)
  T.add_edge(3, 6)
  T.add_edge(3, 7)
  
  ### Positions of the nodes
  pos={}
  pos[1]=numpy.array([ 0,0])
  pos[2]=numpy.array([-2,1])
  pos[3]=numpy.array([ 2,1])
  pos[4]=numpy.array([-3,2])
  pos[5]=numpy.array([-1,2])
  pos[6]=numpy.array([ 1,2])
  pos[7]=numpy.array([ 3,2])
  
  ### Draw nodes and edges
  nx.draw_networkx_nodes(T, pos, nodelist=black, node_color='k',     node_size=400,     alpha=0.8)
  nx.draw_networkx_nodes(T, pos, nodelist=white, node_color='w',     node_size=400,     alpha=0.8)
  nx.draw_networkx_edges(T,pos,width=1.0, alpha=0.5)
  
  plt.axis('off')     # Remove the axes
  plt.show()          # Show the tree
  </code></pre>
  
  <p>The code creates a window with a small tree containing 7 nodes and 6 edges. Now I     want the nodes to disappear when I click at them with the mouse. How can I do this?</p>
  
  <p>Later my plan is that 2 players alternate in turn by removing leafs or the root in their color (black and white). I.e. player 1 can only remove black leaves or black roots, and player two can only remove white leafs and white roots.</p>
  
  <p>I found these links that could be helpful but couldn't get it to work:</p>
  
  <ul>
  <li><a href="https://gist.github.com/Zulko/7629965" rel="nofollow noreferrer">https://gist.github.com/Zulko/7629965</a></li>
  <li><a href="https://gist.github.com/smathot/2011427" rel="nofollow noreferrer">https://gist.github.com/smathot/2011427</a></li>
  <li><a href="https://stackoverflow.com/questions/22052532/matplotlib-python-clickable-points">Matplotlib / python clickable points</a></li>
  </ul>
  
  <p>Anyone who knows how to accomplish this or have some tips?</p>