IDLE ValueError in HyperParser

GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2021-05-17.23:47:23.018>
labels = ['expert-IDLE', 'type-bug', '3.9']
title = 'IDLE ValueError in HyperParser'
updated_at = <Date 2021-05-20.21:47:07.374>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2021-05-20.21:47:07.374>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2021-05-17.23:47:23.018>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 44163
keywords = []
message_count = 6.0
messages = ['393845', '393851', '393987', '394001', '394006', '394072']
nosy_count = 3.0
nosy_names = ['rhettinger', 'terry.reedy', 'taleinat']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue44163'
versions = ['Python 3.9']