Building Command-Line Tools with Python: Custom Word Count Options

Command-line tools are the backbone of efficient developer workflows, but making them user-friendly requires flexible input handling. This text-based course guides you through the process of building a command-line utility from scratch, focusing on how to let users choose exactly what data they want to display. You will start with the fundamental concepts of command-line interfaces, learn how to handle arguments, and write clean, maintainable Python code to process text. By the end of this course, you will be able to build structured command-line tools that accept customizable flags and process inputs efficiently. What you will learn: Understand the foundational concepts of standard input, standard output, and command-line arguments; Parse user options using modern Python libraries to configure tool behavior; Implement core logic to count lines, words, and characters from text files; Apply conditional logic to filter and display only the requested metrics; Structure your Python code using type hints and modular functions for better readability; Handle common file and input errors gracefully to prevent tool crashes. We begin with essential terminology and the basics of terminal interaction before moving step-by-step through writing the logic, parsing options, and refining the output formatting. This course is designed for beginners who have a basic grasp of Python syntax and want to learn how to build practical, real-world terminal utilities. Dive into the text and start building your own custom command-line tools today.