генератор

script.py

def id_generator():
    for i in range(1, 10001):
        yield i


gen = id_generator()


class Employee:
    def __init__(self, name, id =''):
        self.name = name
        self.id = id


class Volunteer(Employee):
    def __init__(self, name, city, status):
        self.city = city
        self.status = status
        Employee.__init__(self, name, "E" + str(next(gen)))

    def display(self):
        return f'{self.name}, г.{self.city}, статус "{self.status}"'


vol = Volunteer("Иван Петров", "Москва", "Наставник")

print(vol.display())