def missing_formatted(self, branches: bool = False) -> str:
        """The missing line numbers, formatted nicely.

        Returns a string like "1-2, 5-11, 13-14".

        If `branches` is true, includes the missing branch arcs also.

        """
        if branches and self.has_arcs:
            arcs = self.missing_branch_arcs().items()
        else:
            arcs = None

        return format_lines(self.statements, self.missing, arcs=arcs)
The missing line numbers, formatted nicely.

        Returns a string like "1-2, 5-11, 13-14".

        If `branches` is true, includes the missing branch arcs also.

        
coverage/results.py