字典列表中的值显示无

Question

我有一个元组列表：

x = [('router_1', '0/47', '0/17', 'router_2'),
     ('router_1', '0/48', '0/17', 'router_3'),
     ('router_4', '0/47', '0/18', 'router_5'),
     ('router_4', '0/48', '0/18', 'router_6')]

目标是构建如下数据：

dict = {"details": [
        {
            "router_1": {
                "connections": [
                    {
                        "side_a": {
                            "device": "router_1",
                            "interface": "0/47",
                        },
                        "side_b": {
                            "interface": "0/17",
                            "device": "router_2",

                        }
                    },
                    {
                        "side_a": {
                            "device": "router_1",
                            "interface": "0/48",
                        },
                        "side_b": {
                            "interface": "0/17",
                            "device": "router_3",
                        }
                    }
                ]
            }
        },
        {
            "router_4": {
                "connections": [
                    {
                        "side_a": {
                            "device": "router_4",
                            "interface": "0/47",
                        },
                        "side_b": {
                            "interface": "0/17",
                            "device": "router_5",
                        }
                    },
                    {
                        "side_a": {
                            "device": "router_4",
                            "interface": "0/48",
                        },
                        "side_b": {
                            "interface": "0/17",
                            "device": "router_6",
                        }
                    }
                ]
            }
        }
    ]
}

请注意：

• 根据“side_a”下的设备名称创建的密钥router_1
• 根据“side_a”下的设备名称创建的密钥router_4

我尝试过以下：

import collections
data_dict = collections.defaultdict(list)

result = {}

for item in x:
 router_a, router_a_int, router_b_int, router_b = item
 result[side_a] = data_dict["connections"].append({"side_a": {
 "hostname": router_a,
 "interface": router_a_int},
 "side_b": {
 "interface": router_b_int,
 "hostname": router_b
 }})

但是，字典的值显示为“None”。看起来每次追加都会导致值为 None 但我虽然使用 collections.defaultdict(list) 应该消除这个问题

请您帮忙。

谢谢你

Answer 1

您只需要调整在循环内创建字典结构的方式。

试试这个：

from collections import defaultdict

data_dict = defaultdict(list)

for item in x:
    router_a, router_a_int, router_b_int, router_b = item
    data_dict[router_a].append({
        "side_a": {
            "device": router_a,
            "interface": router_a_int
        },
    "side_b": {
        "interface": router_b_int,
        "device": router_b
    }
})

result = {"details": [{"{}".format(router): {"connections": connections}} for router, connections in data_dict.items()]}
print(result)