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 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…) Update attributes of an object Destroy an object Resources Read or watch:

cmd module packages concept page uuid module datetime unittest module args/kwargs Python test cheatsheet Learning Objectives At the end of this project, you are expected to be able to explain to anyone, without the help of Google:

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 Requirements Python Scripts Allowed editors: vi, vim, emacs All your files will be interpreted/compiled on Ubuntu 20.04 LTS using python3 (version 3.8.5) All your files should end with a new line The first line of all your files should be exactly #!/usr/bin/python3 A README.md file, at the root of the folder of the project, is mandatory Your code should use the pycodestyle (version 2.7.) All your files must be executable The length of your files will be tested using wc All your modules should have a documentation (python3 -c 'print(import("my_module").doc)') All your classes should have a documentation (python3 -c 'print(import("my_module").MyClass.doc)') All your functions (inside and outside a class) should have a documentation (python3 -c 'print(import("my_module").my_function.doc)' and python3 -c 'print(import("my_module").MyClass.my_function.doc)') A documentation is not a simple word, it’s a real sentence explaining what’s the purpose of the module, class or method (the length of it will be verified) Python Unit Tests Allowed editors: vi, vim, emacs All your files should end with a new line All your test files should be inside a folder tests You have to use the unittest module All your test files should be python files (extension: .py) All your test files and folders should start by test_ Your file organization in the tests folder should be the same as your project e.g., For models/base_model.py, unit tests must be in: tests/test_models/test_base_model.py e.g., For models/user.py, unit tests must be in: tests/test_models/test_user.py All your tests should be executed by using this command: python3 -m unittest discover tests You can also test file by file by using this command: python3 -m unittest tests/test_models/test_base_model.py All your modules should have a documentation (python3 -c 'print(import("my_module").doc)') All your classes should have a documentation (python3 -c 'print(import("my_module").MyClass.doc)') All your functions (inside and outside a class) should have a documentation (python3 -c 'print(import("my_module").my_function.doc)' and python3 -c 'print(import("my_module").MyClass.my_function.doc)') We strongly encourage you to work together on test cases, so that you don’t miss any edge case GitHub There should be one project repository per group. If you clone/fork/whatever a project repository with the same name before the second deadline, you risk a 0% score.

More Info Execution Your shell should work like this in interactive mode:

$ ./console.py (hbnb) 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)

EOF help quit (hbnb) $ $ cat test_help help $ $ cat test_help | ./console.py (hbnb)

EOF help quit (hbnb) $ All tests should also pass in non-interactive mode: $ echo "python3 -m unittest discover tests" | bash