Improving SyntaxError for unmatched parentheses

[serhiy-storchaka]

BPO	33306
Nosy	@serhiy-storchaka
PRs	bpo-33306: Improve SyntaxError messages for unbalanced parentheses. #6516

^{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 = None
closed_at = <Date 2018-12-17.15:46:14.543>
created_at = <Date 2018-04-18.09:22:20.386>
labels = ['interpreter-core', 'type-feature', '3.8']
title = 'Improving SyntaxError for unmatched parentheses'
updated_at = <Date 2018-12-17.15:46:14.542>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2018-12-17.15:46:14.542>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2018-12-17.15:46:14.543>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2018-04-18.09:22:20.386>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 33306
keywords = ['patch']
message_count = 2.0
messages = ['315441', '332011']
nosy_count = 1.0
nosy_names = ['serhiy.storchaka']
pr_nums = ['6516']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue33306'
versions = ['Python 3.8']

[serhiy-storchaka]

SyntaxError messages were improved recently in PyPy. [1] [2] The part of this improvement in CPython (showing an expected token) is discussed in bpo-1634034. The following PR implements other part, related to unmatched parentheses.

Showing the number of the line containing an unmatched opening parenthesis looks as enhancement. But I'm not sure that this change is always an enhancement (in comparison with bpo-1634034). Syntax error for unmatched parentheses will be raised even if the code contains other syntax errors before unmatched parenthesis.

[1] https://morepypy.blogspot.de/2018/04/improving-syntaxerror-in-pypy.html
[2] https://bitbucket.org/pypy/pypy/commits/e66f24650dafbcd2ac1c443af7417eddf8e8f093

[serhiy-storchaka]

New changeset 94cf308 by Serhiy Storchaka in branch 'master':
bpo-33306: Improve SyntaxError messages for unbalanced parentheses. (GH-6516)
94cf308