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Part 10

Accompanying resources

Exercise 1

Create a program called small_town_teller.py

Declare a Person class with the following attributes:

  • id
  • first name
  • last name

Declare an Account class with the following attributes:

  • number
  • type
  • owner
  • balance

Declare a Bank class able to support the following operations:

  • Adding a customer to the bank
  • Adding an account to the bank
  • Removing an account from the bank
  • Depositing money into an account
  • Withdrawing money from an account
  • Balance inquiry for a particular account

From an interactive terminal, you should be able to import these classes an interact with the objects and methods defined above.

Constraints

  • When attempting to register a customer, the customer id must be unique.
  • When attempting to add an account, the user associated with said account must already registered as a customer.
  • When attempting to add an account, the account number must be unique.
from small_town_teller import Person, Account, Bank

zc_bank = Bank()
bob = Person(1, "Bob", "Smith")
zc_bank.add_customer(bob)
bob_savings = Account(1001, "SAVINGS", bob)
zc_bank.add_account(bob_savings)
zc_bank.balance_inquiry(1001)
# 0
zc_bank.deposit(1001, 256.02)
zc_bank.balance_inquiry(1001)
# 256.02
zc_bank.withdrawal(1001, 128)
zc_bank.balance_inquiry(1001)
# 128.02

Exercise 2

Create a program called persistent_small_town_teller.py

Declare a PersistenceUtils class with the following static methods:

  • write_pickle
  • load_pickle

Append the following methods to the Bank class:

  • save_data
  • load_data

This application should extend exercise one so that all of the customers and accounts persist between restarts.

From an interactive terminal:

  • Create customers and accounts.
  • Save the data using the save_data method.
  • Exit the session.
  • Create a new session.
  • Validate there are no customers and no accounts.
  • Load the saved data using the load_data method.
  • Validate the persistence is working.
from persistent_small_town_teller import Person, Account, Bank

zc_bank = Bank()
zc_bank.customers
# {}
zc_bank.accounts
# {}
zc_bank.load_data()
zc_bank.customers
# {1: <persistent_small_town_teller.Person object at 0x1098e6a90>}
zc_bank.accounts
# {1001: <persistent_small_town_teller.Account object at 0x1099e04d0>}