code: def mandatory(self):
      return any(
          [k for k in self.schema.keys() if not self.has_default(k)]
      )
  
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 10 for calling the SchemaDict obj's underlying member method code with example usage: obj.mandatory() and returns: any