__init__.py required for pkgutil.walk_packages in python3

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-01-13.04:47:54.646>
labels = ['3.8', 'type-bug', '3.7', '3.9', 'docs']
title = '__init__.py required for pkgutil.walk_packages in python3'
updated_at = <Date 2020-01-20.12:16:18.752>
user = 'https://github.com/asottile'

bugs.python.org fields:

activity = <Date 2020-01-20.12:16:18.752>
actor = 'methane'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2017-01-13.04:47:54.646>
creator = 'Anthony Sottile'
dependencies = []
files = []
hgrepos = []
issue_num = 29258
keywords = []
message_count = 6.0
messages = ['285361', '289345', '289347', '360298', '360307', '360310']
nosy_count = 7.0
nosy_names = ['ncoghlan', 'methane', 'docs@python', 'eric.snow', 'wolma', 'Anthony Sottile', 'Eric Wieser']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue29258'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']