click-example.py

#!/usr/bin/env python
"""
Simple Click example
"""
import click

@click.command()
@click.option('--km', default=1, help='Number of kilometers')
@click.option('--dec', default=2, help='Number of digits after decimal')
def km_to_mi(km, dec):
    # conversion factor
    conv_fac = 0.621371

    # calculate miles
    miles = round(km * conv_fac, dec)
    print('{} kilometers is equal to {} miles'.format(km, miles))

if __name__ == '__main__':
    km_to_mi()