Getting Started

What’s a command interpreter?

Do you remember the Shell? It’s 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…).

• pdate attributes of an object.

• Destroy an object.

Learning Objectives

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

Execution

Your shell should work like this in interactive mode:

$ ./console.py
(hbnb) help

Documented commands (type help <topic>):

========================================
EOF help quit

(hbnb)
(hbnb)
(hbnb) quit
$ ```

Usage Examples

Launching the console

$ ./console.py
(hbnb) ```

Creating a new object

(hbnb) create
** class name missing **
(hbnb) create User
670265eb-5982-489e-8b92-2dff054f0776 ```

Show an object

(hbnb) show User
** instance id missing **
(hbnb) show User 670265eb-5982-489e-8b92-2dff054f0776
[User] (670265eb-5982-489e-8b92-2dff054f0776) {'created_at': datetime.datetime(2020, 2, 19, 18, 8, 58, 458246), 'id': '670265eb-5982-489e-8b92-2dff054f0776', 'updated_at': datetime.datetime(2020, 2, 19, 18, 8, 58, 458261)}```

Update an object

(hbnb) all
["[User] (70f71c16-962b-48ad-9df8-9203fe23d612) {'created_at': datetime.datetime(2020, 2, 19, 18, 11, 32, 341144), 'id': '70f71c16-962b-48ad-9df8-9203fe23d612', 'updated_at': datetime.datetime(2020, 2, 19, 18, 11, 32, 341161)}"]
(hbnb) update
** class name missing **
(hbnb) update User
** instance id missing **
(hbnb) update User 70f71c16-962b-48ad-9df8-9203fe23d612
** attribute name missing **
(hbnb) update User 70f71c16-962b-48ad-9df8-9203fe23d612  Age "20"
(hbnb) all
["[User] (70f71c16-962b-48ad-9df8-9203fe23d612) {'Age': 20, 'created_at': datetime.datetime(2020, 2, 19, 18, 11, 32, 341144), 'id': '70f71c16-962b-48ad-9df8-9203fe23d612', 'updated_at': datetime.datetime(2020, 2, 19, 18, 13, 9, 937933)}"]
(hbnb)```

Destroy an object

(hbnb) destroy
** class name missing **
(hbnb) destroy User```
** instance id missing **
(hbnb) destroy User 670265eb-5982-489e-8b92-2dff054f0776
(hbnb)