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In Lesson 3, the journey truly begins as you write your first line of Python code. Now that your environment is set up, it’s time to shift from preparation to action, transforming ideas into executable solutions.

We start with the basics of Python, a language known for its simplicity and power, making it a favourite in engineering and scientific fields. You’ll begin by learning how to print a message to the screen—a simple but significant first step. By typing and running the command print(“Hello, World!”), you’ll officially write your first Python program.

Next, we introduce the concept of variables and how Python can be used to perform basic mathematical operations. You’ll learn to store and manipulate data in variables, applying this knowledge to tasks like simple arithmetic—an essential skill in any engineering or scientific endeavour.

We then explore the concept of BIDMAS (Brackets, Indices, Division and Multiplication, Addition and Subtraction) and why understanding the order of operations is crucial for accurate calculations, especially in fields where precision is critical, like structural engineering.

To make this knowledge tangible, you’ll apply it to a practical problem: calculating the area of a rectangle using variables and basic operations in Python. This real-world example demonstrates the power of Python for everyday tasks in engineering and science.

Finally, the lesson wraps up with a summary of what you’ve learned, setting the stage for the next lesson, where you’ll dive deeper into data types—key elements in storing and processing information in Python.

By the end of this lesson, you’ll have confidently written your first lines of code and gained foundational skills in variables and arithmetic that will support your progress in Python. Keep practising, and I’ll see you in the next lesson!
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