code: def visitAttr(self, obj, attr, value, *args, **kwargs):
      if isinstance(value, TTFont):
          return False
      super().visitAttr(obj, attr, value, *args, **kwargs)
  
imports: from fontTools.misc.visitor import Visitor
  from fontTools.ttLib import TTFont
label_desc: Use image node_id 1 for calling the TTVisitor obj's underlying member method code with example usage: obj.visitAttr(obj, attr, value) and returns: False