#!/usr/bin/env python3 # -*- coding: utf-8 -*- """ Parse CLI options. This is a standalone file. Using argparse to parse options. Exit status: 0 EXIT_SUCCESS success 1 EXIT_USAGE failed parsing cli options 2 EXIT_FAILED Execution error """ import os import sys import argparse # # Add basics about this program # PROGRAM = os.path.basename(sys.argv[0]) AUTHOR = "Your Name" EMAIL = "your@email" VERSION = "v1.0.0 (2017-06-16)" def print_info(): """Print usage information about the script.""" return "By {author} ({email}), version {version}".format( author=AUTHOR, email=EMAIL, version=VERSION ) parser = argparse.ArgumentParser(prog=PROGRAM, description=print_info(), formatter_class=argparse.RawTextHelpFormatter) subparsers = parser.add_subparsers(title="commands (positional arguments)", help='Available commands', dest="command") subparsers.add_parser("sum", help="[integers] display the sum of the given numbers") subparsers.add_parser("sub", help="[integers] display the subtraction of the first two given numbers") subparsers.add_parser("square", help="[integers] display the square of the given numbers") parser.add_argument("-s", "--silent", help="decrease output verbosity", action="store_true") parser.add_argument("-v", "--verbose", help="increase output verbosity", action="store_true") parser.add_argument("-V", "--version", action="version", version=VERSION) args, unknown_args = parser.parse_known_args() answer = "" unknown_args = list(map(int, unknown_args)) if args.command == "sum" and unknown_args: result = str(sum(unknown_args)) answer = result if args.verbose: answer = "The sum of {} is: {}".format(", ".join(str(number) for number in unknown_args), result) elif args.command == "square" and unknown_args: for square_me in unknown_args: result = str(square_me**2) square_me = str(square_me) if args.verbose: answer += "{}^2 == {}\n".format(square_me, result) else: answer += result + "\n" elif args.command == "sub" and unknown_args: left_hand = unknown_args[0] right_hand = unknown_args[1] result = left_hand - right_hand if args.verbose: answer = "The result of {}-{} is: {}".format(left_hand, right_hand, result) else: answer = result print(answer)