class_docstr: Extract variable names from the Python AST tree of an Equation (solve.py).
code: def __init__(self, module):
      lhs_node = module.body[0].targets[0]
      rhs_node = module.body[0].value
  
      self.lhs = self._get_vars(lhs_node)
      self.rhs = self._get_vars(rhs_node)
  
      assert len(self.lhs) == 1
  
      for name in self.lhs:
          self.lhs = name
          break
  
file_path: evals/evals/registry/data/solve-for-variable/tools/tester.py
imports: import ast
  from fractions import Fraction
  from solve import EquationGenerator
label_desc: Use image node_id 1 to create a new Vars object  with example: obj = Vars(module)