The latest articles on DEV Community by SaikatCodes (@saikatcodes). https://dev.to/saikatcodes https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4182580%2Fe6ed6741-0b64-447c-a13f-dcde265f54b6.png https://dev.to/saikatcodes en SaikatCodes Tue, 13 Oct 2026 15:56:07 +0000 https://dev.to/saikatcodes/how-a-python-practice-question-became-my-first-github-project-5gp4 https://dev.to/saikatcodes/how-a-python-practice-question-became-my-first-github-project-5gp4 <p>What started as a Python problem-solving exercise gradually became my first publicly documented software project: Transaction Auditor.</p> <p>I was practicing Python functions, loops, lists, sets, and file handling when I began working on a problem involving financial transaction records.</p> <p>Initially, the goal was simple: read transaction data and calculate useful statistics.</p> <p>But as I developed the solution, I discovered that building a reliable program required much more than getting the calculations right.</p> <p>**</p> <h2> What I Built </h2> <p>**</p> <p>Transaction Auditor is a file-based Python program that reads transaction records, validates them, performs financial calculations, and generates an audit report.</p> <ol> <li><p>Its features include:</p></li> <li><p>Detecting duplicate transaction IDs</p></li> <li><p>Rejecting transactions with non-positive amounts</p></li> <li><p>Calculating successful and failed transaction statistics</p></li> <li><p>Generating customer-wise financial summaries</p></li> <li><p>Identifying the highest successful transaction</p></li> <li><p>Finding the customer with the highest successful transaction total</p></li> <li><p>Saving the results in a text report</p></li> </ol> <p>**</p> <h2> The Biggest Challenge: Duplicate Transactions </h2> <p>**</p> <p>One of the most interesting challenges was handling repeated transaction IDs.</p> <p>My initial approach used nested loops to compare transactions. It worked for several test cases, but testing multiple records with the same ID revealed a problem: a rejected transaction could appear more than once in the duplicate report.</p> <p>This taught me an important lesson:</p> <p><strong>Detecting matching pairs isn't always the same as identifying unique rejected transaction occurrences.</strong></p> <p>Testing edge cases helped me understand why the distinction matters.</p> <p>**</p> <h2> What I Learned </h2> <p>**</p> <ol> <li><p>This project strengthened my understanding of:</p></li> <li><p>Python functions and program structure</p></li> <li><p>Lists and sets</p></li> <li><p>Nested loops and conditional logic</p></li> <li><p>File reading and writing</p></li> <li><p>Data validation</p></li> <li><p>Debugging and edge-case testing</p></li> <li><p>Connecting multiple functions into one working program</p></li> </ol> <p>I also learned how to organize a project, document it using Markdown, and publish it on GitHub.</p> <h2> <strong>What Comes Next?</strong> </h2> <p>Transaction Auditor is currently a learning and portfolio project, not a production-ready financial system.</p> <p>Future improvements could include CSV support, stronger input validation, interactive transaction entry, and automated transaction imports.</p> <p>For now, I'm focusing on strengthening my Python fundamentals and building more practical projects.</p> <p>Explore the Project</p> <p><strong>GitHub Repository</strong>: <a href="https://github.com/Saikat703/Transaction-Auditor" rel="noopener noreferrer">Transaction Auditor</a></p> <p>I'd appreciate constructive feedback, especially on improving the program's structure, reliability, and testing.</p> <p>Thanks for reading!</p> python beginners showdev programming