结构
==================================

树形结构
---------

.. autoclass:: takler.core.Bunch
   :members:

.. autoclass:: takler.core.Flow
   :members:

.. autoclass:: takler.core.NodeContainer
   :members:

.. autoclass:: takler.core.Task
   :members:

.. autoclass:: takler.core.node.Node
   :members:

访问工具
----------

.. autoclass:: takler.visitor.NodeVisitor
    :members:

.. autoclass:: takler.visitor.SimplePrintVisitor
    :members:

.. autoclass:: takler.visitor.PrintVisitor
    :members:

.. autofunction:: takler.visitor.pre_order_travel