"""Not a serious example.

Usage:
  calculator_example.py <value> ( ( + | * | ^ | / ) <value> )...
  calculator_example.py <function> <value> [( , <value> )]...
  calculator_example.py (-h | --help)

Examples:
  calculator_example.py 1 + 2 + 3 + 4 + 5
  calculator_example.py 1 + 2 '*' 3 / 4 ^ 5    # note quotes around '*'
  calculator_example.py sum 10 , 20 , 30 , 40

Options:
  -h, --help

"""
from docopt import docopt


if __name__ == '__main__':
    arguments = docopt(__doc__)
    print(arguments)

Add calculator_example.py.