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The TreeWalk class can be used as a superclass in order
to walk an AST or similar tree.

Unlike other treewalkers, this class can walk a tree either
recursively or non-recursively.  Subclasses can define
methods with the following signatures::

    def pre_xxx(self):

src/a/s/astor-HEAD/tests/test_transform.py   astor(Download)
class ConsolidateAttributes(astor.TreeWalk):
    def post_Attribute(self):
        node = self.cur_node
        value = node.value
        value.id += '.' + node.attr
class FindNames(astor.TreeWalk):