我有以下Json：
{
file1: {
path_to_file: 'file1.txt',
children : 'file2'
},
file2: {
path_to_file: 'file1.txt',
children : 'file3,file4'
},
file3: {
path_to_file: 'a/file3.txt',
children : ''
},
file4: {
path_to_file: 'b/file4.txt',
children : ''
}
}
我想从这个Json构造一棵树。每个节点都应具有：名称（file1等），path_to_file（仅是数据字段），并将子级转换为指向下一个节点的“指针”。
我有以下代码：
class Node(object):
def __init__(self, name, path_to_file=None):
self.name = name
self.path_to_file= path_to_file
self.children = []
def add_child(self, obj):
self.children.append(obj)
可以用作：
>>> n = Node(5)
>>> p = Node(6)
>>> q = Node(7)
>>> n.add_child(p)
>>> n.add_child(q)
现在，我想使用json中的属性，而不是上面的数字。所以我有这段代码：
jsonObject= json.load(json_string)
for key in jsonObject:
value = jsonObject[key]
print("The key and value are ({}) = ({})".format(key, value))
这给了我：
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 2 column 4 (char 7)
我如何提取Json对象中的属性以构造对Node类的调用？
您的json不是标准的json格式，应该是双引号，没有单引号
import json
json_string = """
{
"file1": {
"path_to_file": "file1.txt",
"children": "file2"
},
"file2": {
"path_to_file": "file1.txt",
"children": "file3,file4"
},
"file3": {
"path_to_file": "a/file3.txt",
"children": ""
},
"file4": {
"path_to_file": "b/file4.txt",
"children": ""
}
}
"""
jsonObject = json.loads(json_string)
for key in jsonObject:
value = jsonObject[key]
print("The key and value are ({}) = ({})".format(key, value))
输出为：
The key and value are (file1) = ({'path_to_file': 'file1.txt', 'children': 'file2'})
The key and value are (file2) = ({'path_to_file': 'file1.txt', 'children': 'file3,file4'})
The key and value are (file3) = ({'path_to_file': 'a/file3.txt', 'children': ''})
The key and value are (file4) = ({'path_to_file': 'b/file4.txt', 'children': ''})
更新答案
为了更好地显示，我添加了dump方法。
import json
json_string = """
{
"file1": {
"path_to_file": "file1.txt",
"children": "file2"
},
"file2": {
"path_to_file": "file1.txt",
"children": "file3,file4"
},
"file3": {
"path_to_file": "a/file3.txt",
"children": ""
},
"file4": {
"path_to_file": "b/file4.txt",
"children": ""
}
}
"""
class Node(object):
def __init__(self, name, path_to_file=None):
self.name = name
self.path_to_file = path_to_file
self.children = []
def add_child(self, obj):
self.children.append(obj)
def dump(self, indent=0):
"""dump tree to string"""
tab = ' '*(indent-1) + ' |- ' if indent > 0 else ''
print('%s%s' % (tab, self.name))
for obj in self.children:
obj.dump(indent + 1)
name2info = json.loads(json_string)
def get_tree(name):
info = name2info[name]
root = Node(name, info['path_to_file'])
for child in info['children'].split(","):
if child:
root.add_child(get_tree(child))
return root
root = get_tree('file1')
# get children info
print(root.name, root.children[0].name, root.children[0].children[1].path_to_file)
root.dump()
它输出：
file1 file2 b/file4.txt
file1
|- file2
|- file3
|- file4
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