code: def _py_to_couch_translate(key, val):
      
      try:
          if key in ['keys', 'endkey_docid', 'startkey_docid', 'stale', 'update']:
              return {key: val}
          if val is None:
              return {key: None}
          arg_converter = TYPE_CONVERTERS.get(type(val))
          return {key: arg_converter(val)}
      except Exception as ex:
          raise CloudantArgumentError(136, key, ex)
docs: Performs the conversion of the Python parameter value to its CouchDB
      equivalent.