This patch replaces usage of `filter` in such a way that it will be
compatible with Python 3. Also, this patch replaces the usage of `map`
to do a side-effect work with normal `for` loop.
PR-URL: https://github.com/nodejs/node/pull/25583
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>