code: def __contains__(self, item):
      return (
          self._get(self.parse_key(item), default=NoneValue)
          is not NoneValue
      )
  
imports: from collections import OrderedDict
  from pyparsing import lineno
  from pyparsing import col
  import re
  import copy
  from .exceptions import ConfigException, ConfigWrongTypeException, ConfigMissingException
label_desc: Use image node_id 18 for calling the ConfigTree obj's underlying member method code with example usage: obj.__contains__(item) and returns: unknown