Most CLI tools fail not because they lack power — but because they accept garbage input. Today you learn to prevent that. You’ll tame user chaos with: * ✅ nargs for multiple values * ✅ choices to limit options * ✅ type for automatic conversion * ✅ required and default to guide logic * ✅ Custom actions — your CLI, your

Your CLI isn’t just a script anymore — it’s a command suite. This lesson takes you beyond single-command logic and into the world of: * ✅ Organized --help output * ✅ Input safety with mutually exclusive options * ✅ Scalable command families like git add, git commit, git push Grouping Arguments — Clean Up Your Help

Series: Python CLI Mastery — Argparse Deep Dive Goal: Make sure your CLI tool only accepts valid, well-typed input and throws helpful errors when things go wrong. Why Validation Matters Your CLI tool is only as good as the inputs it accepts. If someone passes "banana" when you’re

Welcome to Part 2 of the argparse mastery series — written from real CLI-building experience. Let’s start with the essential tools: boolean flags, default values, type safety, and clear help messages. What You’ll Learn * Boolean flags like --debug, --verbose, etc. * Setting default values * Type conversion (int, float, str) * Writing