class Pupil(object):
    ratings = [1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6]

    def __init__(self, name, surname):
        self.name = name
        self.surname = surname
        self.marks = {}

    @property
    def name(self):
        return self.__name

    @name.setter
    def name(self, value):
        while True:
            if isinstance(value, str) and str.isalpha(value) and len(value) >= 3:
                self.__name = value
                break
            else:
                value = input("Podałeś niepoprawne imię, podaj nowe: ")

    @property
    def surname(self):
        return self.__surname

    @surname.setter
    def surname(self, value):
        while True:
            if isinstance(value, str) and str.isalpha(value) and len(value) >= 3:
                self.__surname = value
                break
            else:
                value = input("Podałeś niepoprawne nazwisko, podaj nowe: ")

    def complete_marks(self):
        while True:
            subject = input("Podaj przedmiot:\t")
            rating = float(input(f"Podaj ocene (dostępne oceny: {self.ratings}):\t"))
            while True:
                if rating in self.ratings:
                    self.marks[subject] = rating
                    break
                else:
                    rating = input(f"Podaj ocene (dostępne oceny: {self.ratings}):\t")
            action = int(input("Dodać kolejny przedmiot (wpisz 1 jeżeli tak):\t"))
            if action != 1:
                break

    def print_marks(self):
        for i in self.marks:
            print(f"{i}: \t{self.marks[i]}")

    def mean(self):
        sum = 0
        count = 0
        for i in self.marks:
            count +=1
            sum += self.marks[i]
        return sum / count

    def __str__(self):
        return f"Imie: {self.__name}, Nazwisko: {self.__surname}, Średnia ocen:\t{self.mean()}"


class Student(Pupil):
    weights_range = (0, 1)

    def __init__(self, name, surname):
        Pupil.__init__(self, name, surname)
        self.weights = {}

    def print_weights(self):
        for i in self.weights:
            print(f"{i}: {self.weights[i]}")

if __name__ == '__main__':
    name = input("Podaj imie:\t")
    surname = input("Podaj nazwisko:\t")
    pupil = Student(name, surname)
    pupil.complete_marks()
    pupil.print_marks()
    print(pupil)
    pupil.print_weights()