获取 JSON 的 str 表示以像 print() 一样进行编码

Question

I need to pass a JSON object that looks like below to a REST API (plz note the escaped " in the value - which is json in string format)

{ "data": "{\"positionname\": \"API User\",\"person\": \"Paul\",}" }

In POSTMAN, using POST method to API endpoint with JSON above, I get 200 and a record created. When I try to do the same from Python Shell using 'requests', it fails:

# JSON as string with proper escape
>>> data = '{"data": "{\\"positionname\\": \\"API User\\", \\"person\\": \\"Paul\\"}"}'
# Loads output removes backslashes
>>> json.loads(data)
{'data': '{"positionname": "API User", "person": "Paul"}'}
# Print output shows data -exactly- as I need to pass it to the API
# The string that print() provides is in the EXACT format that the API requires
# It needs " around data, and the escape \ character is needed.
>>> print (data)
{"data": "{\"positionname\": \"API User\", \"person\": \"Paul\"}"}
# Data still in original format...
>>> data
'{"data": "{\\"positionname\\": \\"API User\\", \\"person\\": \\"Paul\\"}"}'
# Try to pass the data to the API..
>>> response = apiRequest.post('http://apiURL/board/Input', data)
# It fails...
>>> response<Response [400]>
>>> 

Answer 1

You don't need to "trap" the output of print() ; you already have the data.

print() prints the actual data as it really exists , which is distinct from the repr() esentation of that data encoded in Python syntax.

Similarly, a call like file.write(yourdata) or socket.send(yourdata) will send that literal data, not the Python representation thereof.

---

If it's in your control, the logic you use to generate your string should look like this:

content = { "positionname": "API User", "person": "Paul" }
wrapper = { "data": json.dumps(content) }
wrapper_json = json.dumps(wrapper)

...if you print(wrapper_json) , you'll see something formatted in exactly the right way to send to your service.

Answer 2

Your use case looks strange, but if you don't find any satisfactory solution you can try this to get desired output.

data = '{ "data": "{\\"positionname\\": \\"API User\\",\\"person\\": \\"Paul\\",}" }'

dataSplitted = data.split("\\")

output = ""

for word in dataSplitted:
    output = "{}\{}".format(output, word)

output = output[1:]