How to properly override a class constructor?

Question

Python

Greetings.
Yes, the question seems to be noobish, but somehow I'm completely confused.
There is a class inherited from datetime.date. We need to add a couple of attributes and a couple of properties to this class. To do this, I write the __init__ function in my class, in which I do the usual routine: I check the parameters, create new attributes, and then call the parent class constructor.
When I try to instantiate a class using only the attributes that the parent class accepts, everything is fine. When I try to add more attributes, a TypeError is thrown. CHADNT?
A bit of code. This is what my class looks like.

class MyClass(date):
    def __init__(self, m_year: int, m_month: int, m_day: int,
                 expiry: date=None, *args, **kwargs):
        if expiry:
            self._expiry = expiry
        else:
            self._expiry = date(m_year, m_month, m_day)
        super(Maturity, self).__init__(*args, **kwargs)

    @property
    def expiry(self):
        return {'year': self._expiry.year,
                'month': self._expiry.month,
                'day': self._expiry.day}

We create an instance of the class. So everything is fine, both the methods of the parent class and mine work.

>>> q = MyClass(2015, 5, 5)
>>> q
MyClass(2015, 5, 5)
>>> q.strftime('%Y')
'2015'
>>> q.expiry
{'day': 5, 'month': 5, 'year': 2015}

But as soon as I want more, such an exception falls out.

>>> q = MyClass(2015, 5, 5, expiry=date(2015, 5, 1))
TypeError: function takes at most 3 arguments (4 given)

Among other things, it is confusing that the code works the same way both with the 8th line (super call) and without it.

Answer 1

stackoverflow.com/questions/399022/why-cant-i-subc...