arguments_parser.py

import argparse

parser = argparse.ArgumentParser(
    description='Sync docs in MongoDB to Elasticsearch server')
parser.add_argument('inputfile_name',
                    help='the json file contains data to synced from MongoDB')
parser.add_argument('-s', '--server-name',
                    help='the IP address of Elasticsearch server')
parser.add_argument('-i', '--index', help='the index name of ES')
parser.add_argument('-t', '--type-name', help='the type name of the index')
parser.add_argument('-e', '--exclude',
                    help='exclude list by the recurrence.timeStart field')
args = parser.parse_args()

base_url = 'http://%s:%s/%s/%s/' % (args.inputfile_name, args.server_name, args.index, args.type_name)
print(base_url)

• using underscore (inputfile_name for example) in positional arguments
• using dash (--server-name for example) in optional arguments