code: def is_default(self, key):
      if not self.has_default(key):
          return False
      if hasattr(self[key], "__dict__"):
          return True
      else:
          return (
              key not in self or self[key] == self.schema[key].default
          )
  
imports: from __future__ import absolute_import
  from __future__ import print_function
  from __future__ import division
  import inspect
  import importlib
  import re
label_desc: Use image node_id 8 for calling the SchemaDict obj's underlying member method code with example usage: obj.is_default(key) and returns: False, True, unknown