SRP violated

user.py

import datetime


class User:
    def __init__(self, username, banned_until):
        self.username = username
        self.banned_until = banned_until

    def save(self):
        print('I am saving to PostgreSQL')

    def ban(self):
        self.banned_until = datetime.datetime.today() + datetime.timedelta(days=7)

    def charge(self):
        print('Charge credit card of user using Stripe')