在Python中解析JSON参数中的JSON数据

Question

Is it possible to load json with json data inside?

import json
array = '{"container":"{\"foo\":\"bar\"}"}'
data  = json.loads(array)
print(data['container'])

in this code error: json.decoder.JSONDecodeError: Expecting ',' delimiter: line 1 column 17 (char 16)

Answer 1

It is possible, but you need more escaping:

import json
array = '{"container":"{\\"foo\\":\\"bar\\"}"}'
data = json.loads(array)
print(data['container'])

The problem here was that even in single quoted strings, \\" is an escape sequence for a single quote. The backslash needs to be escaped with another backslash to avoid that.

Answer 2

The following implementation works for me with Python3.6.6.

Code:

import json
array = '{"container":{"foo":"bar"}}'
data = json.loads(array)
print(data['container'])
print(data['container']['foo'])

Output:

>>> python3 test.py 
{'foo': 'bar'}
bar

NOTE: If you use the comas around in nested Json then the value of container key will be a string not a dict type (after parsing).

Let's see:

Code:

import json
array = '{"container":"{\\"foo\\":\\"bar\\"}"}'
data = json.loads(array)
print(data['container'])
print(data['container']['foo'])

Output:

>>> python3 test.py 
{"foo":"bar"}
Traceback (most recent call last):
  File "test.py", line 5, in <module>
    print(data['container']['foo'])
TypeError: string indices must be integers

If you really want to use the comas, you need to parse again the nested Json.

Like this:

Code:

import json
array = '{"container":"{\\"foo\\":\\"bar\\"}"}'
data = json.loads(array)
print(data['container'])
data2 = json.loads(data['container'])
print(data2['foo'])

Output:

>>> python3 test.py 
{"foo":"bar"}
bar

Answer 3

Try this

import ast
array = '{"container":"{\\"foo\\":\\"bar\\"}"}'

json_data = ast.literal_eval(array)

print(json_data['container'])  

the output will be {'foo':'bar'}