return days in month paramets

import calendar
from datetime import datetime, date, timedelta


class Agenda(object):

    def __init__(self):
        self._month = datetime.today().month
        self._year = datetime.today().year

    def daysOfMonth(self, year=None, month=None):
        """
        :param year:  
        :param month:
        :return:  days the month in parameters
        """
        year = year or self._year
        month = month or self._month
        first_day_month = date(year, month, 1) 
        year, weekBase, dayBase = first_day_month.isocalendar()
        sunday = 0
        qtd_day_before = 0
        if dayBase != sunday:
            first_day_month = self.dif_date(-dayBase-1, first_day_month)
        day = 0
        list_of_days = []
        for i in range(42):
            day += 1
            _date = self.dif_date(day, first_day_month)
            list_of_days.append({
                                "day": _date 
            })

        return list_of_days

    def dif_date(self, day, date=None):
        """
        :param day:
        :param date:
        :return: diferents day in date 
        """
        _date = date or self._day
        day = _date.toordinal() + day
        return date.fromordinal(day)