code: def __init__(self):
      self._cond_lhs = set()
      self._stable_lhs = set()
  
      self._cond_rhs = set()
      self._stable_rhs = set()
  
      self.undefined = set()
  
      self.seen_break = False
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  from ..visitors import Visitor, visit_children
  from ..visitors.symbol_visitor import get_symbols
  import ast
  from ...utils import py2op
label_desc: Use image node_id 1 to create a new ConditionalSymbolVisitor object from inherited base classes: Visitor with example: obj = ConditionalSymbolVisitor()