unittest discover throws TypeError on namespace packages #80958

assignee = None
closed_at = None
created_at = <Date 2019-05-02.16:47:03.266>
labels = ['3.7', '3.8', 'type-bug', 'library']
title = 'unittest discover throws TypeError on namespace packages'
updated_at = <Date 2020-07-20.03:33:05.899>
user = 'https://github.com/tirkarthi'

activity = <Date 2020-07-20.03:33:05.899>
actor = 'methane'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-05-02.16:47:03.266>
creator = 'xtreak'
dependencies = []
files = []
hgrepos = []
issue_num = 36777
keywords = ['patch']
message_count = 5.0
messages = ['341285', '341339', '341530', '373941', '373980']
nosy_count = 9.0
nosy_names = ['barry', 'brett.cannon', 'eric.smith', 'rbcollins', 'ezio.melotti', 'michael.foord', 'methane', 'augustogoulart', 'xtreak']
pr_nums = ['13259']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36777'
versions = ['Python 3.7', 'Python 3.8']