Python Accounting

(The Account class) Design a class named Account that contains:
■ A private int data field named id for the account.
■ A private float data field named balance for the account.
■ A private float data field named annualInterestRate that stores the current interest rate.
■ A constructor that creates an account with the specified id (default 0), initial balance (default 100), and annual interest rate (default 0).
■ The accessor and mutator methods for id, balance, and annualInterestRate.
■ A method named getMonthlyInterestRate() that returns the monthly interest rate.
■ A method named getMonthlyInterest() that returns the monthly interest.
■ A method named withdraw that withdraws a specified amount from the account.
■ A method named deposit that deposits a specified amount to the account.

Write a test program that creates an Account object with an account id of 1122, a balance of $20,000, and an annual interest rate of 4.5%. Use the withdraw method to withdraw $2,500, use the deposit method to deposit $3,000, and print the id, balance, monthly interest rate, and monthly interest.

class Account():
    def __init__(self, id = 0, balance = 100, annualInterestRate = 0):
        self.__id = id
        self.__balance = balance
        self.__annualInterestRate = annualInterestRate

    def getId(self):
        return self.__id

    def getBalance(self):
        return self.__balance

    def getAnnualInterestRate(self):
        return self.__annualInterestRate

    def setId(self, id):
        self.__id = id

    def setBalance(self, balance):
        self.__balance = balance

    def setAnnualInterestRate(self, annualInterestRate):
        self.__annualInterestRate = annualInterestRate

    def getMonthlyInterestRate(self):
        mir = (self.__annualInterestRate / 100) / 12
        return round(mir, 3)

    def getMonthlyInterest(slef):
        mi = slef.__balance * Account.getMonthlyInterestRate(slef)
        return round(mi, 3)
    def withdraw(self, amount):
        self.__balance = self.__balance - amount

    def deposit(self, amount):
        self.__balance = self.__balance + amount

def main():
    t = Account(1122, 20000, 4.5)
    print('Customer ID: {}, Account balance: {}, Mountly interest rate: {},'
          ' Mountly interest: {}'.format(t.getId(), t.getBalance(), t.getMonthlyInterestRate(),t.getMonthlyInterest()))
    t.withdraw(2500)
    t.deposit(3000)
    print('Customer ID: {}, Account balance: {}, Mountly interest rate: {},'
          ' Mountly interest: {}'.format(t.getId(), t.getBalance(), t.getMonthlyInterestRate(),t.getMonthlyInterest()))

main()

SOLUTION:

Customer ID: 1122, Account balance: 20000, Mountly interest rate: 0.004, Mountly interest: 80.0

Customer ID: 1122, Account balance: 20500, Mountly interest rate: 0.004, Mountly interest: 82.0