SOLID is a set design principles in object-oriented context to make maintainable, testable and extendable software. Single Responsibility A class should only have one responsibility. Furthermore, it should only have one reason to change. Benefits: Testing: A class with one responsibility will have far fewer test cases. Lower coupling: Less functionality in a single class will have fewer dependencies. Organization: Smaller, well-organized classes are easier to search than monolithic ones. Example Bad A class representing a book:

DynamoDB is a fully managed NoSQL database service. Components Tables A table is a collection of data, similar to other database systems. For example a table called Employee can store name, designation, salary, manager, etc. Each item in the table has a unique identifier, or primary key. Besides the primary key, the table is schemaless and does not need to be defined while creating a table. Each item in a table can have its own distinct attributes.

Info This post assumes prior knowledge of python and selenium 4 Installation Selenium: pip install selenium Download the drivers, make sure that your browser, selenium and driver versions are compatible with each other. Chrome: https://chromedriver.chromium.org/downloads Firefox: https://github.com/mozilla/geckodriver/releases Edge: https://developer.microsoft.com/en-us/microsoft-edge/tools/webdriver/ Instantiate your driver Chrome from selenium import webdriver driver = webdriver.Chrome(executable_path="C:/webdrivers/chromedriver.exe") With custom options from selenium import webdriver from selenium.webdriver.chrome.options import Options options = Options() ## option to not show an open browser window options.

Setup User name: git config --global user.name "[firstname lastname]" Email: git config --global user.email "[valid-email]" Color: git config --global color.ui auto Initialization and cloning Make your current folder a git repo: git init Clone a repo: git clone [url] Staging and commits Get status of staged, unstages and untracked files: git status Add files to staging: git add [file] Remove a file from staging: git reset [file] Remove a file from staging and remove all changes: git reset --hard [file] Differences in files that are modified but not staged: git diff Differences in files that are staged but not committed: git diff --staged Commit changes: git commit -m "[message]" Commit only specific portion of a file: git add -p [file] Note: Git will go into interactive mode and prompt options for actions on each hunk.

From May 1st, the government of India has opened several vaccination centers for people aged between 18 to 45. The vaccines are scarce and logging into Cowin app to check status is cumbersome due to frequent timeouts. The government has also made a public API to access vaccine related information like finding availability and downloading vaccination certificates. Using this, I have made a dashboard that makes it easy to find vaccine availability by district or pincode.