import datetime


class Crowd:
    """ kjdsldk jslkjgs lkjgds
    """
    def __init__(self, name, people, aggresiveness=0):
        self.name = name
        self.people = people
        self.aggresiveness = aggresiveness

    def hire(self, *persons):
        self.people += persons

    def get_names(self):
        return [x.full_name for x in self.people]

    def inc_aggresiveness(self, value=1):
        self.aggresiveness += value

    def __repr__(self):
        return 'Crowd(%s, size=%d)' % (
            self.name, len(self.people))

    def __str__(self):
        if self.name:
            return self.name + ': ' + ', '.join(self.get_names()) + ' AGG:%s' % self.aggresiveness
        else:
            return ', '.join(self.get_names()) + ' AGG:%s' % self.aggresiveness

    def __add__(self, other):
        import copy
        t = copy.deepcopy(self)
        if isinstance(other, Crowd):
            t.people += other.people
            return t

        t.hire(other)
        return t

    def __iter__(self):
        self._i = 0
        return self

    def __next__(self):
        if self._i < len(self.people):
            t = self._i
            self._i += 1
            return self.people[t]
        else:
            raise StopIteration


class Person:
    def __init__(self, first_name, last_name, birth_date):
        self.first_name = first_name
        self.last_name = last_name
        self.birth_date = birth_date

    def age(self):
        result = getattr(self, '_age', None)
        if not result:
            result = datetime.date.today().year - \
                self.birth_date.year
            self._age = result
        return result

    @property
    def full_name(self):
        return self.first_name + ' ' + self.last_name

    @full_name.setter
    def full_name(self, full_name):
        self.first_name, self.last_name = \
            tuple(full_name.split())

    def __repr__(self):
        return 'Person(%s, %s, %s)' % (
            self.first_name, self.last_name,
            self.birth_date,
            )

    def __str__(self):
        return '%s is %d years old' % (
            self.full_name,
            self.age(),
        )

    def __add__(self, other):
        return Crowd(None, [self, other])


john = Person('John', 'Doe', datetime.date(year=1985, month=3, day=6))
dave = Person('Dave', 'Jones', datetime.date(year=1989, month=5, day=21))

team = Crowd('IT department', [john, dave])

jane = Person('Jane', 'Brown', datetime.date(year=1987, month=4, day=17))
# # team.hire(jane)
monica = Person('Monica', 'Geller', datetime.date(year=1981, month=3, day=17))

guys = [jane, monica]

# for x in guys:
#     team.hire(x)

team.hire(*guys)

# team1 = Crowd('Support team', [jane, monica], aggresiveness=4)

# print(team)

for guy in team:
    print(guy)