python 实现树结构的打印，,class Tree

python 实现树结构的打印，,class Tree

class TreeNode:    def __init__(self,value):        self.children = []        self.value = value     def add_child(self,*child):        self.children+=child     def show(self,layer):        print  "  "*layer+self.value        map(lambda child:child.show(layer+1),self.children)  def main():    a1 = TreeNode("A-1")    b1 = TreeNode("B-1")    b2 = TreeNode("B-2")    c1 = TreeNode("C-1")    d1 = TreeNode("D-1")    a1.add_child(b1,b2)    b1.add_child(c1,TreeNode("C-2"))    b2.add_child(TreeNode("C-3"),TreeNode("C-4"))    c1.add_child(d1)    d1.add_child(TreeNode("E-1"),TreeNode("E-2"))    a1.show(0)if __name__=="__main__":main()

来源于网络，http://www.cnblogs.com/wangfupeng1988/archive/2011/04/12/2013860.html

打印效果如下：

python 实现树结构的打印