is IOError depricated?

[Gribouillis]

#!/usr/bin/env python3
# -*-coding: utf8-*-
# pyman -- program to browse python documentation.
import argparse
import webbrowser

__version__ = '2019.11.8'

def main(word, version):
    assert version in (2, 3)
    url = "https://docs.python.org/{}/search.html".format(
        version) + ('?q=' + word if word else '')
    webbrowser.open(url)

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description="Search python documentation")
    parser.add_argument('-v', '--version', dest='version', type=int, help='Python version 2 or 3. Defaults to 3.', default=3)
    parser.add_argument('word', metavar='WORD', help='The word to search',
                        default='', nargs='?')
    ns = parser.parse_args()
    main(ns.word, ns.version)