code: def __init__(self, parent=None, level=None):
      if level is None:
          if parent is None:
              level = 0
          else:
              level = parent.level + 1
      self.level = level
      self.parent = parent
      self.refs = {}
      self.loads = {}
      self.stores = set()
  
imports: from ._compat import iteritems
  from .visitor import NodeVisitor
label_desc: Use image node_id 1 to create a new Symbols object from inherited base classes: object with example: obj = Symbols(parent, level)