code: def make_dependent(self, source, target, action):
          '''
          Create a dependency between path 'source' and path 'target' via the
          callable 'action'.
  
          >>> permuter._generators
          [IterValueGenerator(one), IterValueGenerator(two)]
          >>> permuter.make_dependent('one', 'two', lambda x: x + 1)
  
          Going forward, 'two' will only contain values that are (one+1)
          '''
          if not self._generators:
              return
  
          src_permuter, src = self._resolve_child(source)
          dest = self._resolve_child(target)[1]
  
          # pylint: disable=protected-access
          container = src_permuter._generators
          idx = container.index(src)
          container[idx] = DependentValueGenerator(src.name(), dest, action)
  
          self._update_independent_generators(f make_dependent(self, source, target, action):
          '''
          Create a dependency between path 'source' and path 'target' via the
          callable 'action'.
  
          >>> permuter._generators
          [IterValueGenerator(one), IterValueGenerator(two)]
          >>> permuter.make_dependent('one', 'two', lambda x: x + 1)
  
          Going forward, 'two' will only contain values that are (one+1)
          '''
          if not self._generators:
              return
  
          src_permuter, src = self._resolve_child(source)
          dest = self._resolve_child(target)[1]
  
          # pylint: disable=protected-access
          container = src_permuter._generators
          idx = container.index(src)
          container[idx] = DependentValueGenerator(src.name(), dest, action)
  
          self._update_independent_generators()
docs: Create a dependency between path 'source' and path 'target' via the
          callable 'action'.
  
          >>> permuter._generators
          [IterValueGenerator(one), IterValueGenerator(two)]
          >>> permuter.make_dependent('one', 'two', lambda x: x + 1)
  
          Going forward, 'two' will only contain values that are (one+1)