code: def _create_nodes(self, flow):
      module = __import__(flow.__module__)
      tree = ast.parse(inspect.getsource(module)).body
      root = [
          n
          for n in tree
          if isinstance(n, ast.ClassDef) and n.name == self.name
      ][0]
      nodes = {}
      StepVisitor(nodes, flow).visit(root)
      return nodes
  
imports: import inspect
  import ast
  import re
label_desc: Use image node_id 2 for calling the FlowGraph obj's underlying member method code with example usage: obj._create_nodes(flow) and returns: nodes