override __init__ method

sample.py

# coding:utf-8
from __future__ import print_function, unicode_literals


class Hoge(object):
    _foo = None
    _bar = None
    _buz = None

    def __init__(self, foo=1, bar=2, buz="3"):
        self._foo = foo
        self._bar = bar
        self._buz = buz

    def __str__(self):
        return "{foo} | {bar} | {buz}".format(
            foo=self._foo,
            bar=self._bar,
            buz=self._buz,
        )


class Fuga(Hoge):
    _zoo = None

    def __init__(self, zoo=None, *args, **kwargs):
        super(Fuga, self).__init__(*args, **kwargs)
        if zoo is not None and isinstance(zoo, int):
            self._zoo = zoo

    def __str__(self):
        return "{foo} | {bar} | {buz} | {zoo}".format(
            foo=self._foo,
            bar=self._bar,
            buz=self._buz,
            zoo=self._zoo,
        )


if __name__ == "__main__":
    h = Hoge()
    print(h)  # noqa: T001

    f = Fuga()
    print(f)  # noqa: T001