General
How to create a Python package
How to create a command interpreter in Python using the cmd module
What is Unit testing and how to implement it in a large project
How to serialize and deserialize a Class
How to write and read a JSON file
How to manage datetime
What is an UUID
What is *args and how to use it
What is **kwargs and how to use it
How to handle named arguments in a function
First step: Write a command interpreter to manage your AirBnB objects
This is the first step towards building your first full web application: the AirBnB clone. This first step is very important because you will use what you build during this project with all other following projects: HTML/CSS templating, database storage, API, front-end integration.
Each task is linked and will help you to:
put in place a parent class (called BaseModel) to take care of the initialization, serialization and deserialization of your future instances
create a simple flow of serialization/deserialization: Instance <-> Dictionary <-> JSON string <-> file
create all classes used for AirBnB (User, State, City, Place) that inherit from BaseModel
create the first abstracted storage engine of the project: File storage.
create all unittests to validate all our classes and storage engine
Whats a command interpreter?
Do you remember the Shell? Its exactly the same but limited to a specific use-case. In our case, we want to be able to manage the objects of our project:
Create a new object (ex: a new User or a new Place)
Retrieve an object from a file, a database etc
Do operations on objects (count, compute stats, etc)
Update attributes of an object
Destroy an object
Your shell should work like this in interactive mode:
$ ./console.py
(hbnb) help
Documented commands (type help ):
========================================
EOF help quit
(hbnb)
(hbnb)
(hbnb) quit
$
But also in non-interactive mode: (like the Shell project in C)
$ echo "help" | ./console.py
(hbnb)
Documented commands (type help ):
========================================
EOF help quit
(hbnb)
$
$ cat test_help
help
$
$ cat test_help | ./console.py
(hbnb)
Documented commands (type help ):
========================================
EOF help quit
(hbnb)
$
(hbnb)create BaseModel
49faff9a-6318-451f-87b6-910505c55907
(hbnb)show BaseModel 49faff9a-6318-451f-87b6-910505c55907
[BaseModel] (49faff9a-6318-451f-87b6-910505c55907) {'updated_at': datetime.datetime(2021, 2, 18, 18, 4, 12, 756946), 'created_at': datetime.datetime(2021, 2, 18, 18, 4, 12, 75683\
6), 'id': '49faff9a-6318-451f-87b6-910505c55907'}
(hbnb)update BaseModel 49faff9a-6318-451f-87b6-910505c55907 first_name "Betty"
(hbnb)show BaseModel 49faff9a-6318-451f-87b6-910505c55907
[BaseModel] (49faff9a-6318-451f-87b6-910505c55907) {'created_at': datetime.datetime(2017, 10, 2, 3, 10, 25, 903293), 'id': '49faff9a-6318-451f-87b6-910505c55907', 'updated_at': datetime.datetime(2017, 10, 2, 3, 10, 25, 903300)}
(hbnb)destroy BaseModel 49faff9a-6318-451f-87b6-910505c55907
(hbnb)show BaseModel 49faff9a-6318-451f-87b6-910505c55907
** no instance found **
(hbnb) quit
Samuel Ogoigbe
Mark Tanui