How should I write a tree using diconary. I have used a dictonary to make a tree.

tree={best:collections.defaultdict(lambda:default)} in a id3 tree.

Is there a way to multple values and when then only return on type of values.

I tried this apporach but it did not work.

class Tree:
    def __init__(self):
        pass



    def ini(self,default_tree,d_attr):
        self.tree={d_attr:collections.defaultdict(lambda:default_tree)}
        self.tree_A={d_attr:collections.defaultdict(lambda:default_tree)}
        self.tree_I={d_attr:collections.defaultdict(lambda:default_tree)}
        self.tree_p={d_attr:collections.defaultdict(lambda:default_tree)}
        self.tree_n={d_attr:collections.defaultdict(lambda:default_tree)}
        return self.tree

    def __call__(self,best,val,subtree):
        self.tree[best][val]=subtree

def input_tree(self,best,val,subtree,postive,negative,attribute_value,info_gain):
        tree=self.tree
        print best
        print val
        tree[best][val]=subtree
        print self.tree
        self.tree_A[best][val]= attribute_value
        self.tree_I[best][val]= info_gain
        self.tree_p[best][val]= postive
        self.tree_n=negative
        tree=self.tree
        return tree
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