How to Pass INF2611: Visual Programming with Python & PyQt (2025 Guide)

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Study Tips & Tricks for INF2611: Visual Programming with Python & PyQt (2025 Guide)

Module: INF2611 (Visual Programming I)
Language: Python 3 & PyQt
Prescribed Textbook: Introduction to Python Programming and Developing GUI Applications with PyQT (B.M. Harwani)

Introduction

If you are coming from COS1511 or COS2614, INF2611 will feel like a breath of fresh air. Instead of the strict syntax of C++, you will be using Python, which reads almost like English.

However, do not underestimate it. This module is not just about writing scripts; it is about building full Desktop Applications with buttons, menus, and databases using the Qt Framework.

The Syllabus Breakdown

Based on the prescribed Harwani textbook, the module is split into two distinct halves:

Part 1: Python Fundamentals (Chapters 1–6)

The first half of the semester focuses on pure Python.

  • Basics: Variables, Loops (for, while), and Strings.
  • Advanced: Object-Oriented Programming (Classes & Inheritance), File Handling, and Exception Handling.
  • Tip: If you already know coding, you can fly through this. If not, Python is the best language to learn on.

Part 2: GUI Development with PyQt (Chapters 7–12)

This is the core of the module. You stop writing code that runs in a black console window and start creating real windows with buttons.

  • Qt Designer: You will learn to use a “drag-and-drop” tool to design your interface (similar to Visual Studio).
  • PyQt: You will write Python code to make those buttons actually do something.

The 3 Concepts You Must Master

1. Signals and Slots

This is the heartbeat of Qt. In C++, you might call it an “Event Listener.” In PyQt, it’s called Signals and Slots.

  • Signal: Something happens (e.g., User clicks a button).
  • Slot: A function that runs in response (e.g., The app closes).
  • Exam Tip: You will likely be asked to write code that connects a specific signal (like clicked()) to a custom function.

2. The pyuic Conversion

You will design your forms in Qt Designer, which saves them as .ui files (XML). Python cannot run these directly.

  • You must know how to use the command line tool (pyuic4 or pyuic5) to convert that .ui file into a .py python script.
  • Warning: UNISA is very strict about software versions. If the tutorial letter says use Python 3.2 and PyQt4, do NOT install Python 3.12 and PyQt6. Your code might not run on the lecturer’s machine.

3. Database Connectivity (Chapter 12)

The final chapter covers connecting your Python app to a MySQL database.

  • You need to know how to install the MySQLdb module.
  • You must be able to write SQL queries inside your Python code to INSERT, UPDATE, or SELECT data from the database.

My Top Tips for Distinction

1. Master the “Generated Code” Structure
When you convert a design file to Python, it generates a class usually named Ui_MainWindow. You need to understand how to import this class into your main logic file. Don’t edit the generated file directly! Create a separate file (e.g., main.py) to run your logic.

2. Practice with “Qt Designer”
Don’t try to code the GUI layout by hand. It is painful and unnecessary. Open Qt Designer, drag a button, a label, and a text box, and try to make a simple Calculator. If you can build a Calculator that actually adds numbers, you are ready for the exam.

3. Watch out for Indentation
Python does not use curly braces {} like C++. It uses indentation (spaces). One wrong space can break your entire loop or class. Use a good editor like VS Code or PyCharm that handles indentation for you.

Conclusion

INF2611 is a very rewarding module because you end up with a tangible application you can show friends. Stick to the textbook examples, master the Signal/Slot mechanism, and ensure your database connection strings are correct.

Good luck coding!

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