urllib IPv6 parsing fails with special characters in passwords

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-04-23.13:44:30.837>
labels = ['type-bug', 'library']
title = 'urllib IPv6 parsing fails with special characters in passwords'
updated_at = <Date 2019-10-15.17:08:55.251>
user = 'https://github.com/benaryorg'

bugs.python.org fields:

activity = <Date 2019-10-15.17:08:55.251>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-04-23.13:44:30.837>
creator = 'benaryorg'
dependencies = []
files = []
hgrepos = []
issue_num = 33342
keywords = []
message_count = 7.0
messages = ['315668', '317119', '327239', '334273', '334302', '334303', '354745']
nosy_count = 5.0
nosy_names = ['vstinner', 'tjollans', 'martin.panter', 'benaryorg', 'metaperl']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue33342'
versions = ['Python 2.7', 'Python 3.6']