def decode_nullable(self, data_type, obj):
if obj is not None:<EOL><INDENT>return self.json_compat_obj_decode_helper(data_type.validator, obj)<EOL><DEDENT>else:<EOL><INDENT>return None<EOL><DEDENT>
The data_type argument must be a Nullable.
See json_compat_obj_decode() for argument descriptions.