Dependency Injection and Dependency Inversion
Dependency injection and dependency inversion are two terms that often come together but serve distinct meanings and purposes.
Python
Preventing Flaky Tests and Brittle Tests
Flaky tests and brittle tests are two common pitfalls that make our tests unreliable and hard to maintain. In this post, I will illustrate these concepts wit...
Provision an Amazon EKS cluster with AWS CDK
Previously, I posted a tutorial on creating and configuring an Amazon VPC by using AWS CDK. All the examples in that post are based on L1 constructs to illus...
Memory Profiling CPython Applications with Memray
Memory management in modern programming languages is well-abstracted away from programmers. We do not have direct control over how our programs allocate and ...
Property Based Testing with Hypothesis
What is Property Based Testing? Property based testing, which is known to be originated by QuickCheck, is a testing technique which randomly generates test c...
Building a Serverless Function using Amazon API Gateway and AWS Lambda
This post is a quick tutorial to build a very simple serverless function using Amazon API Gateway and AWS Lambda.
Consumer-Driven Contract Testing with Pact
Consumer-driven contract testing (or CDC for short) is a testing methodology that ensures that providers are compatible with the expectations that the consum...
Single Responsibility Principle - explained with examples
The single-responsibility principle is one of the SOLID principles, the most widely accepted software design guide. I intentionally added “widely accepted” t...
Creating a VPC with AWS CDK
The AWS CDK(Cloud Development Kit) is an open-source framework to provision and manage the cloud resources using familiar programming languages.
Redlock: Distributed Lock Manager with Redis
A couple years ago, I discovered an issue caused by a race condition that occured in the backend application I was maintaining. So I implemented a simple dis...
Liskov Substitution Principle and Circle-ellipse Problem
The circle-ellipse problem, or square–rectangle problem, illustrates a limitation of OOP (object-oriented programming). Specifically, it violates the Liskov ...
Python Descriptors
A descriptor in Python is a class attribute which defines any of the special methods: __get__(self, obj, owner=None) -> value __set__(self, obj, valu...
Peformance Comparison between Flask and Sanic
Flask and Sanic Flask is one of the most popular micro web frameworks written in Python and I love using it for developing a wide range of web services becau...