DEV Community: AbreuY

Basic backend template following best practices

AbreuY — Fri, 24 Feb 2023 20:16:58 +0000

Here I want to explain a little what would be the points to take into account to build a simple backend following good practices.

Choose a Programming Language: Choose a programming language that suits your project needs. Some popular backend languages include Python, Node.js, Ruby, and Java.

Use a Web Framework: Choose a web framework that helps you build your API efficiently. Some popular web frameworks include Flask and Django (for Python), Express (for Node.js), and Ruby on Rails (for Ruby).

Use an ORM: Use an ORM (Object-Relational Mapping) to interact with the database. An ORM abstracts away the SQL code and provides an easier interface to work with. Some popular ORMs include SQLAlchemy (for Python) and Sequelize (for Node.js).

Use a Relational Database: Use a relational database to store your data. Some popular databases include MySQL, PostgreSQL, and SQLite.

Use Authentication and Authorization: Implement user authentication and authorization to protect your API from unauthorized access. Some popular authentication and authorization libraries include OAuth2 and JWT (JSON Web Tokens).

Use HTTPS: Use HTTPS to secure the communication between the client and server.

Implement Rate Limiting: Implement rate limiting to prevent abuse of your API.

Use Environment Variables: Use environment variables to store sensitive information like API keys and database credentials.

Implement Logging: Implement logging to track errors and debug your API.

Write Tests: Write unit tests and integration tests to ensure that your API is working as expected.

Here's an example directory structure for a Python Flask backend using SQLAlchemy and SQLite:

├── app/
│   ├── models/
│   │   ├── __init__.py
│   │   ├── user.py
│   ├── routes/
│   │   ├── __init__.py
│   │   ├── auth.py
│   ├── __init__.py
│   ├── extensions.py
│   ├── config.py
├── tests/
│   ├── test_auth.py
├── run.py

In this example, the app directory contains the main Flask application code, with the models directory holding the ORM models, the routes directory holding the API routes, and the extensions.py and config.py files holding the configuration settings for the app. The tests directory holds the unit and integration tests. The run.py file is the entry point to the application.

This is just a basic boilerplate, and you can customize it based on your project needs.

Photo by Markus Spiske: https://www.pexels.com/photo/display-coding-programming-development-1921326/

[Python] Sort a list - Hard & Easy way

AbreuY — Sat, 24 Sep 2022 20:43:59 +0000

Sorting a list in ascending and descending order.

Hard way!

arr = [5,2,8,7,1]
temp = 0
for i in range(0,len(arr)):
    for j in range(i+1, len(arr)):
        if arr[i] > arr[j]:
            temp = arr[i]
            arr[i] = arr[j]
            arr[j] = temp

print("Array sorted in ascending order: ")

for i in range(0, len(arr)):
    print(arr[i], end=" ")

for i in range(0,len(arr)):
    for j in range(i+1, len(arr)):
        if arr[i] < arr[j]:
            temp = arr[i]
            arr[i] = arr[j]
            arr[j] = temp

print("", end="\n")

print("Array sorted in descending order: ")

for i in range(0, len(arr)):
    print(arr[i], end=" ")

Easy way!

arr.sort()
print("", end="\n")
print("Array sorted in ascending order: ")
print(arr)

print("", end="\n")
print("Array sorted in descending order: ")
arr.sort(reverse=True)
print(arr)

Demo

[Python] Looping with FizzBuzz

AbreuY — Fri, 09 Sep 2022 04:24:00 +0000

Statement:
Write the code needed to print to the console all the numbers from 1 to 100.

For multiples of 3, instead of the number, print Fizz.
For multiples of 5, print Buzz.
For numbers which are multiples of both 3 and 5, print FizzBuzz.

Solution:

for i in range(1, 101):

    if i % 3 == 0:
        print("Fizz")
    elif i % 5 == 0:
        print("Buzz")
    else:
        print(i)

    if i % 3 == 0 and i % 5 == 0:
        print("FizzBuzz")

View the working code

[Python] Determine if the first number is a multiple of the second

AbreuY — Wed, 11 May 2022 12:58:45 +0000

Statement:
Given two integers, determine if the first number is a multiple of the second.

Solution:

number1 = int(input("Write a number"))
number2 = int(input("Write other number"))

if number1 % number2 == 0:
    print(f'Is multiple of {number1}')
else:    
    print(f'Is not a multiple of {number2}')

View working code