title: How identify left (True) and right (False) branch
body: <p>I exported a scikit-learn DecisionTree to a .dot file with export_graphviz.</p>
  
  <p>In a different module I want to load the tree from the .dot file and fill a different tree structure.</p>
  
  <p><strong>Question:</strong> How do I decide if a branch is the left one (take if condition is True) or the right one (taken if condition is False)? Is it just by order in the .dot file?</p>
  
  <p><strong>Example:</strong></p>
  
  <pre><code>digraph Tree {
  0 [label="condition 1\ngini = 0.16772448\nsamples = 5000", shape="box"] ;
  1 [label="gini = 0.0000\nsamples = 2994\nvalue = [    0.  2994.]", shape="box"] ;
  0 -&gt; 1 ;
  2 [label="gini = 0.0000\nsamples = 2994\nvalue = [    2006.  0.]", shape="box"] ;
  0 -&gt; 2 ;
  [..]
  </code></pre>
  
  <p>So here 0->1 would be Left/True?</p>
  
  <p><strong>Question:</strong> How do I get this information from the pydot.Dot.obj_dict? Does the attribute <code>sequence</code> help?</p>
  
  <p><strong>Example:</strong></p>
  
  <pre><code>pprint.pprint(dot_tree.obj_dict)
  {'attributes': {},
  'current_child_sequence': 18,
  'edges': {('0', '1'): [{'attributes': {},
                          'parent_edge_list': None,
                          'parent_graph': &lt;pydot.Dot object at 0x2778fd0&gt;,
                          'points': ('0', '1'),
                          'sequence': 3,
                          'type': 'edge'}],
  [..]
  'name': 'Tree',
  'nodes': {'0': [{'attributes': {'label': '"a condition\\ngini = 0.16772448\\nsamples = 5000"',
                               'shape': '"box"'},
                   'name': '0',
                   'parent_graph': &lt;pydot.Dot object at 0x2778fd0&gt;,
                   'parent_node_list': None,
                   'port': None,
                   'sequence': 1,
                   'type': 'node'}],
  [..]
  'parent_graph': &lt;pydot.Dot object at 0x2778fd0&gt;,
  'simplify': False,
  'strict': False,
  'subgraphs': {},
  'suppress_disconnected': False,
  'type': 'digraph'}
  </code></pre>