2. Systematic Installation of Python 3
Step-by-step installation of Python 3 on Windows, PATH configuration, and verification in Command Prompt.
Step 1: Download Python from Official Website
Open your browser and visit python.org/downloads. Click the yellow button indicated by the red arrow on the screenshot below:

Step 2: Check "Add python.exe to PATH" & Click Install
Open the downloaded setup file. Before clicking Install Now, make sure to check the box at the bottom:

Step 3: Setup Completed Successfully
When the installation progress completes, you will see the "Setup was successful" confirmation screen. Click "Close".

Step 4: Verify in Command Prompt
Press Win + R, type cmd, and press Enter. Run the following verification commands:
Step 5: Launch IDLE & Test First Program
Search for "IDLE" in Windows Start Menu and launch it. Try calculating pediatric drug dosage interactively: