<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def add_warning(self, exception: BELParserWarning, context: Optional[Mapping[str, Any]] = None, ) -> None: """Add a warning to the internal warning log in the graph, with optional context information. :param exception: The exception that occurred :param context: The context from the parser when the exception occurred """

        self.warnings.append((
            self.path,
            exception,
            {} if context is None else context,
        ))