'zlib compression' not found in set(['RLE', 'ZLIB', None]) #72145

assignee = 'https://github.com/tiran'
closed_at = <Date 2016-09-06.09:37:45.221>
created_at = <Date 2016-09-05.22:23:57.765>
labels = ['type-bug', 'tests']
title = "'zlib compression' not found in set(['RLE', 'ZLIB', None])"
updated_at = <Date 2016-09-06.09:37:45.219>
user = 'https://github.com/tiran'

activity = <Date 2016-09-06.09:37:45.219>
actor = 'christian.heimes'
assignee = 'christian.heimes'
closed = True
closed_date = <Date 2016-09-06.09:37:45.221>
closer = 'christian.heimes'
components = ['Tests']
creation = <Date 2016-09-05.22:23:57.765>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 27958
keywords = []
message_count = 3.0
messages = ['274448', '274461', '274463']
nosy_count = 2.0
nosy_names = ['christian.heimes', 'python-dev']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue27958'
versions = ['Python 3.5', 'Python 3.6']