Python Write a JSON temporary file from a dictionary

Question

I'm working on a python(3.6) project in which I need to write a JSON file from a Python dictionary.

Here's my dictionary:

{'deployment_name': 'sec_deployment', 'credentials': {'type': 'type1', 'project_id': 'id_001',}, 'project_name': 'Brain', 'project_id': 'brain-183103', 'cluster_name': 'numpy', 'zone_region': 'europe-west1-d', 'services': 'Single', 'configuration': '', 'routing': ''}

And I need to write credentials key to a JSON file.

Here's how I have tried:

tempdir = tempfile.mkdtemp()
saved_umask = os.umask(0o077)
path = os.path.join(tempdir)
cred_data = data['credentials']
with open(path + '/cred.json', 'a') as cred:
    cred.write(cred_data)
credentials = prepare_credentials(path + '/cred.json')
print(credentials)
os.umask(saved_umask)
shutil.rmtree(tempdir)

It's not writing a JSON formatted file, then generated file is as:

{
  'type': 'type1',
  'project_id': 'id_001',
}

it comes with single quotes instead of double quotes.

Possible duplicate of [Convert string to JSON using Python](https://stackoverflow.com/questions/4528099/convert-string-to-json-using-python) — Natesh bhat, Jun 28 '18 at 11:32
Don't write the `dict` directly, write it with the `json` module so it gets properly encoded, i.e. `json.dump(cred_data, cred)` — zwer, Jun 28 '18 at 11:38

score 19 · Answer 1 · answered Nov 22 '20 at 16:54

Actually this should be with the more Python 3 native method.

import json,tempfile
config = {"A":[1,2], "B":"Super"}
tfile = tempfile.NamedTemporaryFile(mode="w+")
json.dump(config, tfile)
tfile.flush()
print(tfile.name)

To break this down:

We load tempfile, and ensure that there's a name with NamedTemporaryFile
We dump the dictionary as a json file
We ensure it has been written to via flush()
Finally we can grab the name to check it out

Note that we can keep the file for longer with delete=False when calling the NamedTemporaryFile

score 2 · Accepted Answer · answered Jun 28 '18 at 11:30

2

Use the json module

Ex:

import json
with open(path + '/cred.json', 'a') as cred:
    json.dump(cred_data, cred)

answered Jun 28 '18 at 11:30

Rakesh

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Python Write a JSON temporary file from a dictionary

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