def move_watch(self, from_literal, to_literal, node):
        if not to_literal in self.watch_chains:
            self.watch_chains[to_literal] = collections.deque()

        node.move_watch(from_literal, to_literal)
        self.watch_chains.pop(from_literal)
        self.watch_chains[to_literal].appendleft(node)
Retrieve the section number of the given node.
dataset/ETHPy150Open enthought/depsolver/depsolver/solver/rules_watch_graph.py/RulesWatchGraph.move_watch--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/lore/tree.py/getSectionNumber