https://github.com/zipcodecore/python10ex
https://github.com/zipcodecore/python10ex
Last synced: 5 months ago
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- Host: GitHub
- URL: https://github.com/zipcodecore/python10ex
- Owner: ZipCodeCore
- Created: 2022-03-15T19:38:06.000Z (almost 4 years ago)
- Default Branch: master
- Last Pushed: 2022-03-15T19:38:08.000Z (almost 4 years ago)
- Last Synced: 2025-01-08T12:41:23.964Z (12 months ago)
- Size: 1000 Bytes
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
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Metadata Files:
- Readme: README.md
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README
# Part 10
## Accompanying resources
* Slide deck: https://zipcoder.github.io/reveal-slides.data-engineering/zcw_content/python/fundamentals-part10.html
## 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.
```python
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.
```python
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: }
zc_bank.accounts
# {1001: }
```