从给定的字典创建一棵树

Create a tree from a given dictionary(从给定的字典创建一棵树)

问题描述

我有一个 python 字典，我想用它创建一棵树.字典是这样的:

I have a python dictionary and I would like to create a tree from it. The dictionary is something like this:

dict_={"2":{'parent': "1"},"1":{'parent': None},"3":{'parent': "2"}}

在这种情况下，根是1"

in this case, the root is "1"

我尝试使用 treelib 库，但是当我在字典上迭代并创建节点时出现问题，但尚未创建其父节点.例如，如果我想为2"创建一个节点，它的父节点(1")还没有创建，所以不能这样做.任何的想法?

I tried to use treelib library but the problem when I iterate on the dictionary and create a node, its parent isn't created yet. For example, if I want to create a node for "2", its parent("1") isn't created yet, so can not do it. Any idea?

推荐答案

您可以使用 treelib 执行以下操作:

You could do the following, using treelib:

from treelib import Node, Tree

dict_ = {"2": {'parent': "1"}, "1": {'parent': None}, "3": {'parent': "2"}}

added = set()
tree = Tree()
while dict_:

    for key, value in dict_.items():
        if value['parent'] in added:
            tree.create_node(key, key, parent=value['parent'])
            added.add(key)
            dict_.pop(key)
            break
        elif value['parent'] is None:
            tree.create_node(key, key)
            added.add(key)
            dict_.pop(key)
            break

tree.show()

输出

1
└── 2
    └── 3

想法是仅当父节点存在于树中或父节点None 时才添加节点.当父为 None 时，将其添加为 root.

The idea is to add a node only if the parent is present in the tree or the parent is None. When the parent is None add it as root.

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