Monty in Python 3 (Ubuntu Linux) on CoCalc

from monty.json import MSONable

class MSONClass(MSONable):

    def __init__(self, a, b, c, d=1, **kwargs):
        self.a = a
        self.b = b
        self._c = c
        self._d = d
        self.kwargs = kwargs

c = MSONClass(3, "abc", True, foo="bar")

c.to_json()

from monty.itertools import chunks
import string
list(chunks(string.ascii_uppercase, 7))