IDLE: Failures when running tests by import (autotest)

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-10-11.16:55:04.544>
labels = ['3.7', 'type-bug', 'tests']
title = 'Failures and crashes when running tests by import'
updated_at = <Date 2017-10-20.20:46:32.491>
user = 'https://github.com/denis-osipov'

bugs.python.org fields:

activity = <Date 2017-10-20.20:46:32.491>
actor = 'serhiy.storchaka'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Tests']
creation = <Date 2017-10-11.16:55:04.544>
creator = 'denis-osipov'
dependencies = []
files = []
hgrepos = []
issue_num = 31761
keywords = []
message_count = 14.0
messages = ['304163', '304225', '304245', '304270', '304273', '304295', '304296', '304298', '304300', '304326', '304647', '304674', '304679', '304682']
nosy_count = 6.0
nosy_names = ['terry.reedy', 'vstinner', 'docs@python', 'serhiy.storchaka', 'Mariatta', 'denis-osipov']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue31761'
versions = ['Python 3.7']