How do I build CLIs with argparse or Typer?

Building command-line interfaces (CLIs) in Python can be efficiently done using libraries like argparse and Typer. Both libraries provide powerful features to create user-friendly command-line tools.

# Example using argparse
import argparse

def main():
    parser = argparse.ArgumentParser(description="A simple CLI example using argparse.")
    parser.add_argument("name", type=str, help="Your name")
    parser.add_argument("--greet", action="store_true", help="Greet the user")

    args = parser.parse_args()

    if args.greet:
        print(f"Hello, {args.name}!")
    else:
        print(f"Goodbye, {args.name}.")

if __name__ == "__main__":
    main()
    

# Example using Typer
import typer

def main(name: str, greet: bool = False):
    if greet:
        typer.echo(f"Hello, {name}!")
    else:
        typer.echo(f"Goodbye, {name}.")

if __name__ == "__main__":
    typer.run(main)