code: def py_to_couch_validate(key, val):
      
      if key not in RESULT_ARG_TYPES:
          raise CloudantArgumentError(116, key)
      # pylint: disable=unidiomatic-typecheck
      # Validate argument values and ensure that a boolean is not passed in
      # if an integer is expected
      if (not isinstance(val, RESULT_ARG_TYPES[key]) or
              (type(val) is bool and int in RESULT_ARG_TYPES[key])):
          raise CloudantArgumentError(117, key, RESULT_ARG_TYPES[key])
      if key == 'keys':
          for key_list_val in val:
              if (not isinstance(key_list_val, RESULT_ARG_TYPES['key']) or
                      type(key_list_val) is bool):
                  raise CloudantArgumentError(134, RESULT_ARG_TYPES['key'])
      if key == 'stale':
          if val not in ('ok', 'update_after'):
              raise CloudantArgumentError(135, val)
docs: Validates the individual parameter key and value.