code: def register(self, obj, deps=None, required_files=None, manager=None, task_class=None):
          
          task_workdir = None
          if hasattr(self, "workdir"):
              task_workdir = os.path.join(self.workdir, "t" + str(len(self)))
  
          if isinstance(obj, Task):
              task = obj
  
          else:
              # Set the class
              if task_class is None:
                  task_class = AbinitTask
  
              task = task_class.from_input(obj, task_workdir, manager)
  
          self._tasks.append(task)
  
          # Handle possible dependencies given either as dict or list.
          if deps is not None:
              if hasattr(deps, "items"):
                  deps = [Dependency(node, exts) for node, exts in deps.items()]
              task.add_deps(deps)
  
          # Handle possible dependencies.
          if required_files is not None:
              task.add_required_files(required_files)
  
          return task
docs: Registers a new :class:`Task` and add it to the internal list, taking into account possible dependencies.
  
          Args:
              obj: :class:`AbinitInput` instance or `Task` object.
              deps: Dictionary specifying the dependency of this node or list of dependencies
                    None means that this obj has no dependency.
              required_files: List of strings with the path of the files used by the task.
                  Note that the files must exist when the task is registered.
                  Use the standard approach based on Works, Tasks and deps
                  if the files will be produced in the future.
              manager:
                  The :class:`TaskManager` responsible for the submission of the task. If manager is None, we use
                  the `TaskManager` specified during the creation of the :class:`Work`.
              task_class: Task subclass to instantiate. Default: :class:`AbinitTask`
  
          Returns:
              :class:`Task` object