hello_argparse.py

#!/usr/bin/env python3
"""A hello world in python using argparse"""
import argparse
import sys


def parse_args():
  p = argparse.ArgumentParser(description=__doc__)
  p.add_argument('name', help='The name of the entity to be greeted')
  p.add_argument('--emoji', action='store_true', default=False,
                 help='Enables a hand wave emoji in the greeting')
  p.add_argument('--language',
                 choices=['english', 'nederlands'],
                 default='english',
                 help='Sets the language for the greeting'
                )
  return p.parse_args()


def main():
  args = parse_args()
  
  if args.language == 'english':
    greeting = 'Hello'
  elif args.language == 'nederlands':
    greeting = 'Hoi'
    
  if args.emoji:
    print(f'{greeting} {args.name} 👋')
  else:
    print(f'{greeting} {args.name}')

if __name__ == '__main__':
  sys.exit(main())

$ ./hello.py
usage: hello.py [-h] [--emoji] [--language {english,nederlands}] name
hello.py: error: the following arguments are required: name
cyle@wse-server-1:~$ ./hello.py  --help
usage: hello.py [-h] [--emoji] [--language {english,nederlands}] name

A hello world in python using argparse

positional arguments:
  name                  The name of the entity to be greeted

optional arguments:
  -h, --help            show this help message and exit
  --emoji               Enables a hand wave emoji in the greeting
  --language {english,nederlands}
                        Sets the language for the greeting
                        
$ ./hello.py Person
Hello Person

$ ./hello.py Person --emoji
Hello Person 👋

$ ./hello.py Person --emoji --language nederlands
Hoi Person 👋