Python - dump dict as a json string

Question

What am I missing? I want to dump a dictionary as a json string.

I am using python 2.7

With this code:

import json
fu = {'a':'b'}
output = json.dump(fu)

I get the following error:

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/gevent-1.0b2-py2.7-linux-x86_64.egg/gevent/greenlet.py", line 328, in run
    result = self._run(*self.args, **self.kwargs)
  File "/home/ubuntu/workspace/bitmagister-api/mab.py", line 117, in mabLoop
    output = json.dump(fu)
TypeError: dump() takes at least 2 arguments (1 given)
<Greenlet at 0x7f4f3d6eec30: mabLoop> failed with TypeError

@kampu Some research failure but not *severe*, leaving out one letter of a function call is no big deal, maybe just an accident. An attempt and error are showing so according to SO guidelines so it follows the site format. — jamylak, Jun 09 '15 at 07:05
My "research" led me here, so this is not a pointless question. Better he ask here and in so doing answer 10,825 viewers' question than leave them wondering where to start to look for the problem. This is why StackOverflow is a thing. RTFM is actually difficult, and often insufficient. — Peter H. Boling, Oct 21 '16 at 07:32
Possible duplicate of [Converting Dictionary to JSON in python](https://stackoverflow.com/questions/26745519/converting-dictionary-to-json-in-python) — Martin Tapp, Oct 16 '18 at 18:36

score 59 · Accepted Answer · answered May 21 '13 at 11:08

59

Use json.dumps to dump a str

>>> import json
>>> json.dumps({'a':'b'})
'{"a": "b"}'

json.dump dumps to a file

answered May 21 '13 at 11:08

jamylak

128,818
30
231
230

score 12 · Answer 2 · answered May 21 '13 at 11:10

12

i think the problem is json.dump. try

json.dumps(fu)

answered May 21 '13 at 11:10

suhailvs

20,182
14
100
98

score 2 · Answer 3 · edited May 06 '17 at 12:05

2

You can use json.dumps.

Example:

import json

json.dumps({'zuckerberg':'tech','sachin':'cricket'})

This outputs:

'{"zuckerberg": "tech", "sachin": "cricket"}'

If you want to sort the keys, use sort_keys as the second argument to json.dumps:

json.dumps({'zuckerberg':'tech','sachin':'cricket'},sort_keys=True)

Outputs:

'{"sachin": "cricket", "zuckerberg": "tech"}'

edited May 06 '17 at 12:05

Drenmi

8,492
4
42
51

answered May 06 '17 at 11:36

Sharath BJ

1,393
1
12
16

thanks Drenmi for formating , was new to stackoverflow ,i will improve next time while answering – Sharath BJ May 06 '17 at 13:44
`sort_keys` is nice for debugging – jamylak Mar 06 '23 at 23:03

score 0 · Answer 4 · edited Mar 06 '23 at 23:04

0

message={"message":"Done", "result":"1"}
message_json = simplejson.dumps(message)
payload = message_json

##or 
message={"message":"Done", "result":"1"}
message_json=jsonify(message)

edited Mar 06 '23 at 23:04

jamylak

128,818
30
231
230

answered Apr 17 '19 at 10:43

Eyasu

240
3
13

1

While this code may solve the question, [including an explanation](//s.tk/meta/questions/114762/explaining-entirely-code-based-answers) really helps to improve the quality of your post. – 4b0 Apr 17 '19 at 10:49

Python - dump dict as a json string

4 Answers4

Linked