Links: PYTHON - PROGRAMMING
Rel: python standard library
Ref:
Tags : #public

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import argparse

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argparse_calculator (sentdex)

import argparse #argument parser
import sys
def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('--x', type=float, default=1.0,
        help='What is the first number?')
    parser.add_argument('--y', type=float, default=1.0,
        help='What is the first number?')
    parser.add_argument('--operation', type=str, default='add',
        help='What operation? (add, sub, mul, div)')

    args = parser.parse_args()
    sys.stdout.write(str(calc(args)))
    # brings output to console {: id="brings-output-to-console" }

def calc(args):
    if args.operation == 'add':
        return args.x + args.y
    elif args.operation == 'sub':
        return args.x - args.y
    elif args.operation == 'mul':
        return args.x * args.y
    elif args.operation == 'div':
        return args.x / args.y

# $ python 2argparse_sys.py --x=5 --y=2 --operation=mul {: id="$-python-2argparse-sys.py---x=5---y=2---operation=mul" }
# 10.0 {: id="10.0" }

# $ python 2argparse_sys.py -h, --help {: id="$-python-2argparse-sys.py--h,---help" }
# usage: 2argparse_sys.py [-h] [--x X] [--y Y] [--operation OPERATION] {: id="usage:-2argparse-sys.py-[-h]-[--x-x]-[--y-y]-[--operation-operation]" }
# optional arguments: {: id="optional-arguments:" }
#   -h, --help            show this help message and exit {: id="-h,---help------------show-this-help-message-and-exit" }
#   --x X                 What is the first number? {: id="--x-x-----------------what-is-the-first-number?" }
#   --y Y                 What is the first number? {: id="--y-y-----------------what-is-the-first-number?" }
#   --operation OPERATION {: id="--operation-operation" }
#                         What operation? (add, sub, mul, div) {: id="what-operation?-(add,-sub,-mul,-div)" }