正如问题所解释的那样，我一直在尝试生成嵌套的JSON对象。在这种情况下，我有for循环从字典dic中获取数据。下面是代码：
f = open("test_json.txt", 'w')
flag = False
temp = ""
start = "{\n\t\"filename\"" + " : \"" +initial_filename+"\",\n\t\"data\"" +" : " +" [\n"
end = "\n\t]" +"\n}"
f.write(start)
for i, (key,value) in enumerate(dic.iteritems()):
f.write("{\n\t\"keyword\":"+"\""+str(key)+"\""+",\n")
f.write("\"term_freq\":"+str(len(value))+",\n")
f.write("\"lists\":[\n\t")
for item in value:
f.write("{\n")
f.write("\t\t\"occurance\" :"+str(item)+"\n")
#Check last object
if value.index(item)+1 == len(value):
f.write("}\n"
f.write("]\n")
else:
f.write("},") # close occurrence object
# Check last item in dic
if i == len(dic)-1:
flag = True
if(flag):
f.write("}")
else:
f.write("},") #close lists object
flag = False
#check for flag
f.write("]") #close lists array
f.write("}")
预期输出为：
{
"filename": "abc.pdf",
"data": [{
"keyword": "irritation",
"term_freq": 5,
"lists": [{
"occurance": 1
}, {
"occurance": 1
}, {
"occurance": 1
}, {
"occurance": 1
}, {
"occurance": 2
}]
}, {
"keyword": "bomber",
"lists": [{
"occurance": 1
}, {
"occurance": 1
}, {
"occurance": 1
}, {
"occurance": 1
}, {
"occurance": 2
}],
"term_freq": 5
}]
}
但是目前我得到如下输出：
{
"filename": "abc.pdf",
"data": [{
"keyword": "irritation",
"term_freq": 5,
"lists": [{
"occurance": 1
}, {
"occurance": 1
}, {
"occurance": 1
}, {
"occurance": 1
}, {
"occurance": 2
},] // Here lies the problem "," before array(last element)
}, {
"keyword": "bomber",
"lists": [{
"occurance": 1
}, {
"occurance": 1
}, {
"occurance": 1
}, {
"occurance": 1
}, {
"occurance": 2
},], // Here lies the problem "," before array(last element)
"term_freq": 5
}]
}
请帮助，我正在尝试解决它，但是失败了。请不要将其标记为重复，因为我已经检查了其他答案并且完全没有帮助。
编辑1：
输入基本上是从映射类型为dic的字典<String, List>中获取的
例如：“刺激” => [1、3、5、7、8]
其中刺激是关键，并映射到页码列表。
这基本上是在外部for循环中读取的，其中key是关键字，value是该关键字出现的页面列表。
编辑2：
dic = collections.defaultdict(list) # declaring the variable dictionary
dic[key].append(value) # inserting the values - useless to tell here
for key in dic:
# Here dic[x] represents list - each value of x
print key,":",dic[x],"\n" #prints the data in dictionary
参考方案
@andrea -f对我来说看起来不错，这是另一种解决方案：
随意选择两者:)
import json
dic = {
"bomber": [1, 2, 3, 4, 5],
"irritation": [1, 3, 5, 7, 8]
}
filename = "abc.pdf"
json_dict = {}
data = []
for k, v in dic.iteritems():
tmp_dict = {}
tmp_dict["keyword"] = k
tmp_dict["term_freq"] = len(v)
tmp_dict["lists"] = [{"occurrance": i} for i in v]
data.append(tmp_dict)
json_dict["filename"] = filename
json_dict["data"] = data
with open("abc.json", "w") as outfile:
json.dump(json_dict, outfile, indent=4, sort_keys=True)
同样的想法，我首先创建一个大的json_dict以直接保存在json中。我使用with语句保存json以避免捕获exception
另外，如果将来需要改进json.dumps()输出，则应该查看json的文档。
编辑
而且只是为了好玩，如果您不喜欢tmp var，则可以单行处理所有数据for循环：）
json_dict["data"] = [{"keyword": k, "term_freq": len(v), "lists": [{"occurrance": i} for i in v]} for k, v in dic.iteritems()]
它可以为最终解决方案提供一些不完全可读的内容，例如：
import json
json_dict = {
"filename": "abc.pdf",
"data": [{
"keyword": k,
"term_freq": len(v),
"lists": [{"occurrance": i} for i in v]
} for k, v in dic.iteritems()]
}
with open("abc.json", "w") as outfile:
json.dump(json_dict, outfile, indent=4, sort_keys=True)
编辑2
看来您不想将json保存为所需的输出，但还是想读取它。
实际上，您也可以使用json.dumps()来打印json。
with open('abc.json', 'r') as handle:
new_json_dict = json.load(handle)
print json.dumps(json_dict, indent=4, sort_keys=True)
但是，这里仍然存在一个问题，因为列表中"filename":的d在data之前，所以f会打印在列表的末尾。
要强制命令，您将必须在字典的生成中使用OrderedDict。请注意，python 2.X的语法很丑（imo）
这是新的完整解决方案;）
import json
from collections import OrderedDict
dic = {
'bomber': [1, 2, 3, 4, 5],
'irritation': [1, 3, 5, 7, 8]
}
json_dict = OrderedDict([
('filename', 'abc.pdf'),
('data', [ OrderedDict([
('keyword', k),
('term_freq', len(v)),
('lists', [{'occurrance': i} for i in v])
]) for k, v in dic.iteritems()])
])
with open('abc.json', 'w') as outfile:
json.dump(json_dict, outfile)
# Now to read the orderer json file
with open('abc.json', 'r') as handle:
new_json_dict = json.load(handle, object_pairs_hook=OrderedDict)
print json.dumps(json_dict, indent=4)
将输出：
{
"filename": "abc.pdf",
"data": [
{
"keyword": "bomber",
"term_freq": 5,
"lists": [
{
"occurrance": 1
},
{
"occurrance": 2
},
{
"occurrance": 3
},
{
"occurrance": 4
},
{
"occurrance": 5
}
]
},
{
"keyword": "irritation",
"term_freq": 5,
"lists": [
{
"occurrance": 1
},
{
"occurrance": 3
},
{
"occurrance": 5
},
{
"occurrance": 7
},
{
"occurrance": 8
}
]
}
]
}
但是要小心，在大多数情况下，最好保存常规的.json文件以使它们成为跨语言的。
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