[Python] How do I configure JsonFormatter in logging dictConfig?

I'd like to use logging.config.dictConfig with a json config file. But I want to use a formatter from another class: pythonjsonlogger.jsonlogger.JsonFormatter

What's wrong with this code/json:

$ cat test.json
{
"version": 1,
"disable_existing_loggers": "true",
"formatters": {
"json": {
"class": "pythonjsonlogger.jsonlogger.JsonFormatter"
# also tried "jsonlogger.JsonFormatter" (comment not in real file)
}
},
"handlers": {
"console": {
"class": "logging.StreamHandler",
"level": "DEBUG",
"formatter": "json",
"stream": "ext://sys.stdout"
}
},
"loggers": { },
"root": {
"handlers": ["console"],
"level": "DEBUG"
}
}


code:

import sys
sys.path.append('/usr/local/lib/python2.7/site-packages')
import json
import logging
import logging.config
from pythonjsonlogger import jsonlogger

fp = open('/test.json')
logging.config.dictConfig(json.load(fp))
fp.close()
logging.info('test log line')


output:

test log line


Expected something like { "message": "test log line" }

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