Python Command-Line Tools: Reading Standard Input

Command-line utilities are the backbone of automated workflows, data pipelines, and system administration. To build truly useful tools, your Python scripts must know how to interact with standard input and output streams. This course teaches you how to accept and process text streams directly from the terminal, enabling your scripts to work seamlessly with pipes and redirects. You will start with foundational concepts of standard streams, understanding how operating systems pass data between programs. From there, you will write clean, modern Python code to read and analyze stream data, starting with simple line counts and moving toward robust text processing. What you'll learn: - Understand the core concepts of standard input, standard output, and standard error streams - Read data dynamically from stdin using modern Python library standards - Build a custom word and line counting command-line utility - Process streaming data efficiently without loading entire large files into memory - Apply robust error handling to manage empty inputs and unexpected stream termination - Test your command-line tools using pytest to ensure reliable stream processing This course guides you step-by-step from raw terminal input basics to a fully functional command-line tool. You will explore how to write clean, maintainable Python code that integrates perfectly with Unix-like pipelines. This course is designed for beginner Python developers and system administrators who want to transition from basic scripts to writing professional command-line utilities. No advanced programming experience is required. Start reading and processing terminal data streams with your own Python tools today.