Build a CLI application with Python and Typer
CLI applications are ubiquitous and we are using them every day whether it be Git, Curl, or Pip. In this blog, I will show you how to build a Site Connectivity Checker using Python and Typer. Typer is a fantastic library for quickly building CLI apps using Python's standard type hints. It's written by the same author of FastAPI - Sebastián Ramírez. Overview Our application will make GET requests to the URLs provided by the users as a...
Fun with Factory Design Pattern and Python
What is the design pattern/ Software design pattern? When pattern word comes to us what do we think? When software engineers try to solve a problem, always try to find a pattern that they already used before or try to create a new one. Because it is very important for future uses and others can understand it well. That’s why design pattern comes and there are some patterns that are approved worldwide. These are very much logical...
Refactoring and Unit Test – Demystifying Gilded Rose
The Gilded Rose Kata is a very popular refactoring exercise that is intended for practicing your test case writing and refactoring skills. It represents the dreaded situation we have to face as software engineers when we have to work on a legacy codebase and add a new feature to it...
Managing Python Dependencies in Serverless
Bundle external Python dependencies in your Serverless projects with virtualenv and serverless-python-requirements plugin....
A journey to AWS Lambda integration testing with Python, Localstack, and Terraform
To start with unit testing for AWS Lambda, we can just choose a testing framework and start writing our beautiful unit tests. For testing AWS services we also can use some mock tools like moto. But what about integration testing? A solution may be to deploy with the Continuous Deployment tool and run some test code against real AWS services. But there are some problems: It takes more time to deploy every timeRunning test code against AWS takes more timeIncreases the AWS bills So...
Deal with the change of field data type of PynamoDB, an ORM of DynamoDB
PynamoDB, with a Python interface, is a great ORM for AWS DynamoDB. DynamoDB is a NoSQL database with scalability and security and it has awesome API and SDKs. PynamoDB wraps the underneath APIs of DynamoDB and gives a beautiful pythonic way to use DynamoDB. In real-world our DB fields are not constant. It can change with the requirements update of our project. The hard part is when you have to maintain the old and new features. For example, a field data type can change from String to...
SQLAlchemy and The Unit of Work Pattern
SQLAlchemy is a very powerful and easy to use ORM written in Python. It really helps to develop applications faster. This blog post is about how we can use Unit of Work pattern when using SQLAlchemy ORM (an ORM written in Python for Relational Databases). This blog post assumes that you are already familiar with SQLAlchemy, know how to setup and connect to database and know how to play with basic operations using SQLAlchemy. Traditional way to...
From CSV to Google Sheet Using Python
Recently I have written a Python script for my Manager. The purpose the script was to read some JSON data, apply some business rules on them, generate a CSV(Comma Separated Value) file and upload it in a Google Spread Sheet. The sheet helped my manager to get insight of the JSON data so that he can take action based on it. The JSON data and business rules of the script are very specific for my manager....
Structure Your Project with Flask Blueprint
Flask is a lightweight WSGI web application framework based on Python. It is designed in such a way that it will only supply the core components of a web application and it lets the developer choose rest of the things. It leaves all the design and architecture level decisions to the developer. As a result it is very easy to get started start with Flask. But day by day when the application gets bigger and more...
Flask with SQLAlchemy & Marshmallow
In the article we will build a simple REST API using Flask, SQLAlchemy and Marshmallow. We will be building a note taking application where these two API endpoints /note/ and /note// will be available....
