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

Answer 1

You can try using json.dumps to dump str like this:

>>> import json

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

'{"a": "b"}'

json.dump dumps to a file

Answer 2

You should use json.dump:-

json.dumps(fu)