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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