Idle: make 3.x Hyperparser.get_expression recognize ...

[terryjreedy]

BPO	21787
Nosy	@terryjreedy

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2014-06-17.06:58:02.291>
labels = ['expert-IDLE', 'type-feature', '3.7']
title = 'Idle: make 3.x  Hyperparser.get_expression recognize ...'
updated_at = <Date 2017-09-28.06:59:39.290>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2017-09-28.06:59:39.290>
actor = 'taleinat'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2014-06-17.06:58:02.291>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 21787
keywords = []
message_count = 1.0
messages = ['220800']
nosy_count = 1.0
nosy_names = ['terry.reedy']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue21787'
versions = ['Python 3.6', 'Python 3.7']

[terryjreedy]

3.0 introduced ... as Ellipsis literal. Test: add '...\n' to the end of the test code. In test_get_expression, add at the end
p = get('12.3')
self.assertEqual(p.get_expression(), '...')
which now fails with AssertionError: '' != '...'.