gistfile1.py

from ujson import dumps
import pprint

class Test:
    def __init__(self):
        self.data = "foobar"
        self._data = "barfoo"

class Test2(Test):
    def toDict(self):
        return {"foobar":"majs"}

t1 = Test()
t2 = Test2()
pprint.pprint(dumps(t1))
pprint.pprint(dumps(t2))

################
# python test.py
# '{"data":"foobar"}'
# '{"foobar":"majs"}'