根据这篇文章,如果我要引用在循环中更新的字典(而不是始终引用相同的字典),我需要在字典上使用.copy()
。然而,在下面的代码示例中,这似乎不起作用:
main.py
:
import collections
import json
nodes_list = ['donald', 'daisy', 'mickey', 'minnie']
edges_list = [('donald', 'daisy', '3'), ('mickey', 'minnie', '3'), ('daisy', 'minnie', '2')]
node_dict, edge_dict = collections.defaultdict(dict), collections.defaultdict(dict)
ultimate_list = []
for n in nodes_list:
node_dict["data"]["id"] = str(n)
ultimate_list.append(node_dict.copy())
for e in edges_list:
edge_dict["data"]["id"] = str(e[2])
edge_dict["data"]["source"] = e[0]
edge_dict["data"]["target"] = e[1]
ultimate_list.append(edge_dict.copy())
print(json.dumps(ultimate_list, indent=2))
因此,我得到了以下结果:
[
{
"data": {
"id": "minnie"
}
},
{
"data": {
"id": "minnie"
}
},
{
"data": {
"id": "minnie"
}
},
{
"data": {
"id": "minnie"
}
},
{
"data": {
"target": "minnie",
"id": "2",
"source": "daysi"
}
},
{
"data": {
"target": "minnie",
"id": "2",
"source": "daysi"
}
},
{
"data": {
"target": "minnie",
"id": "2",
"source": "daysi"
}
}
]
我原本期望得到这样的结果:
[
{
"data": {
"id": "donald"
}
},
{
"data": {
"id": "daisy"
}
},
{
"data": {
"id": "mickey"
}
},
{
"data": {
"id": "minnie"
}
},
{
"data": {
"target": "donald",
"id": "3",
"source": "daysi"
}
},
{
"data": {
"target": "mickey",
"id": "3",
"source": "minnie"
}
},
{
"data": {
"target": "minnie",
"id": "2",
"source": "daysi"
}
}
]
请问有人能告诉我这里我做错了什么吗?
(涉及IT技术)
ultimate_list
听起来很特别 - Chris_Rands