Library Typer

Typer is a library for creating command-line interface applications in Python. It makes it easy to create CLI applications with support for arguments, options, subcommands, and automatic help generation.

Main features of Typer:

• @typer.command() decorator for defining commands and subcommands.
• Automatic parsing of arguments and options.
• Validation and type annotations for arguments and options.
• Automatic help generation with descriptions.
• Built-in Click support for backward compatibility.

Typer is commonly used for creating command-line utilities, CLI interfaces for Python applications, API clients, DevOps tools, and other tasks where a simple and convenient command-line interface is needed.

import typer

app = typer.Typer()

@app.command()
def hello(name: str):
    # Translation: "User greeting"
    print(f"Hello {name}")

@app.command()
def goodbye(name: str, formal: bool = False):
    # Translation: "Farewell to user"
    if formal:
        print(f"Goodbye Ms./Mr. {name}. Have a good day.")
    else:
        print(f"Bye {name}!")

if __name__ == "__main__":
    app()