Boilerplate code for accepting and parsing command line arguments in Python and Javascript

argparse_boilerplate.py

#!/usr/bin/python3
import argparse

parser = argparse.ArgumentParser(description="Grep for JSON log files")
parser.add_argument('pattern', help='pattern to search for in each line')
parser.add_argument('file', help='file to search the pattern in')
parser.add_argument('-k', help='search only in keys of the JSON object', action="store_true")
# Implement rest of the command line flags here
args = parser.parse_args()

file = args.file
pattern = args.pattern
search_only_in_keys = args.k

yargs_boilerplate.js

#!/usr/bin/env node
const yargs = require('yargs')

const argv = yargs.command({
    command: '$0 <pattern> <file>',
    describe: 'Grep for JSON log files',
    builder: {
        k: {
            describe: 'search only in keys of the JSON object',
            type: 'boolean'
        }
        // Implement rest of the command line flags here
    }
}).help('h').alias('help', 'h').argv

let fileName = argv.file
let pattern = argv.pattern

const search_only_in_keys = argv.k