person_superclass.py

class Person:
    def __init__(self, name, person_id):
        self.name = name
        self.person_id = person_id

    def load_account(self, amount):
        # fetch the amount from the server
        current_balance = 100
        current_balance += amount
        # save the new balance to the server

    def check_in(self, arriving_time):
        record_time = arriving_time