Wolt Summer 2023 Engineering Intern Assignment

About the project 💻

This is my solution for Wolt Summer 2023 Engineering Intern assignment. The purpose of this app is to determine the delivery price for customer.

• This solution was built using Python.
• Calculations for delivery fee run in O(1) time complexity.

Libraries 📚

• Poetry for managing dependencies and packaging.
• Invoke for automating tasks on command line.
• FastAPI library to construct an HTTP API.
• NumPy and datetime to calculate the delivery fees.
• Mypy for checking typing.
• Flake8 for code analyzing
• Black for auto-formatting.
• Unittest for testing.

Other things to note ✏️

• Continuous integration is enabled by Github Actions.
• Additional validations have been implemented:
  • The values for cart_value, delivery_distance, and amount_of_items must be positive numbers (greater than 0) and the input data must be in a proper format for all variables. → If the input data is of an incorrect type, an error message will be displayed.

Usage 🔧

Prerequisites

• Python 3.9 or later
• Poetry

Install dependencies & Run the app

Install the dependencies:

poetry install

Activate the poetry environment:

poetry shell

Run the server:

poetry run invoke start

The API documentation is available at http://127.0.0.1:8000/docs.

Testing 🔭

100% of the code has been tested. Below is a screenshot of the coverage report and commands to run and view the tests.

Test the app:

poetry run invoke test

Create coverage html:

poetry run invoke coverage

Get coverage report:

poetry run invoke coverage-report

View report on Firefox browser:

poetry run invoke coverage-view

Other useful commands 💙

Check typing:

poetry run invoke mypy

Generate a code analysis:

poetry run invoke flake

Auto-format the code

poetry run invoke black