Playground Repository

This repository is for my personal experimentation.
DO NOT TRY TO CLONE AND RUN

Problem

Python Interview Questions

Mr. Zac is the new manager of the Wolff International Bank. He has requested that a new banking system be deployed.
You have been assigned the task of developing a new banking system software for the client.

With reference to Python Object Oriented Programming:

Design a core banking system software that meets Mr. Zac's requirements. Create the following classes for the bank:

Bank Class
eServices Class

Bank Class
Using functions, your software should perform basic banking functions like:

Allowing tellers to view customer details (customer name, customer account number, customer phone number, customer address)
The banking system should be able to accept debit & credit transactions on any account.

Create a function that writes each account created to a file. The prefix of the profile should be the account number and the extension, "wolff". Eg. 11231001.wolff
eServices Class
Create a class called eServices then create an eService Type (e.g. Mobile Banking). Every customer should be able to access any eService Type.

Solution

Create project structure

This project uses Django

$ pip install django

Create Django Project

$ django-admin startproject banking_system

Create app in banking_system

$ cd banking_system
$ django-admin startapp bank

Run

$ python manage.py runserver

visit http://localhost:8000/

Add some code

Modify file; replace content bank/views.py

from django.http import HttpResponse


# The welcome page
def index(request):
    return HttpResponse("Hello, welcome to Wolff International Bank.")

Create file bank/urls.py

from django.conf.urls import url

from . import views

urlpatterns = [
    url(r'^$', views.index, name='index'),
]

Add import from django.conf.urls import include, url in banking_system/urls.py and add line

urlpatterns = [
    url(r'^index/', include('bank.urls')),
    ...
]

In banking_system/settings.py register bank app in INSTALLED_APPS

INSTALLED_APPS = [
    'django.contrib.admin',
    ...
    'bank.apps.BankConfig',
]

Modify file bank/models.py

from django.db import models


class CardType(models.Model):
    type = models.CharField(max_length=100)


class Card(models.Model):
    card_type = models.ForeignKey(CardType, on_delete=models.CASCADE)
    card_number = models.IntegerField


class Address(models.Model):
    street = models.CharField(max_length=100)
    city = models.CharField(max_length=100)
    zip = models.CharField(max_length=8)


class Customer(models.Model):
    name = models.CharField(max_length=60)
    age = models.IntegerField(default=18)
    account_number = models.CharField("account number", max_length=100)
    phone = models.CharField("phone number", max_length=100)
    address = models.ForeignKey(Address, on_delete=models.CASCADE)
    card = models.ForeignKey(Card, on_delete=models.CASCADE)
    created = models.DateTimeField("date created")


class TransactionType(models.Model):
    type = models.CharField(max_length=100)


class Transaction(models.Model):
    type = models.ForeignKey(TransactionType, on_delete=models.CASCADE)
    account = models.ForeignKey(Customer, on_delete=models.CASCADE)

Run migrations

Generate migration file

$ python manage.py makemigrations bank

To see the generated sql:

$ python manage.py sqlmigrate bank 0001

Now, run migrate to create those model tables in your database:

$ python manage.py migrate

This is work in progress

juliuskrah / playground