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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def visit(self, node):
 """Walk a parse tree, transforming it into another representation. Recursively descend a parse tree, dispatching to the method named after the rule in the :class:`~parsimonious.grammar.Grammar` that produced bold = '<b>' responsibility to subclass :class:`NodeVisitor` and implement those methods. """

        method = getattr(self, 'visit_' + node.expr_name, self.generic_visit)

        # Call that method, and show where in the tree it failed if it blows
        # up.
        try:
            return method(node, [self.visit(n) for n in node])
        except (VisitationError, UndefinedLabel):
            # Don't catch and re-wrap already-wrapped exceptions.
            raise
        except self.unwrapped_exceptions:
            raise
        except Exception:
            # Catch any exception, and tack on a parse tree so it's easier to
            # see where it went wrong.
            exc_class, exc, tb = exc_info()
            reraise(VisitationError, VisitationError(exc, exc_class, node), tb)