randomeline.py

import click
import random

def random_choice(input):
    line = random.choice(open(input, encoding='utf8').readlines())
    if line:
        return line
    else:
        return random_choice(input)

@click.command()
@click.argument('input', type=click.Path(exists=True))
def main(input):
    line = random_choice(input)

    click.echo(line)
    
    click.pause()




if __name__ == '__main__':
    main()