argparse: assertion failure if optional argument has square/round brackets in metavar #58254

assignee = None
closed_at = <Date 2016-01-17.06:20:12.682>
created_at = <Date 2012-02-18.05:21:48.914>
labels = ['type-bug', 'library']
title = 'argparse: assertion failure if optional argument has square/round brackets in metavar'
updated_at = <Date 2018-06-09.01:28:05.561>
user = 'https://bugs.python.org/oxplot'

activity = <Date 2018-06-09.01:28:05.561>
actor = 'miss-islington'
assignee = 'none'
closed = True
closed_date = <Date 2016-01-17.06:20:12.682>
closer = 'martin.panter'
components = ['Library (Lib)']
creation = <Date 2012-02-18.05:21:48.914>
creator = 'oxplot'
dependencies = []
files = ['24554']
hgrepos = []
issue_num = 14046
keywords = []
message_count = 7.0
messages = ['153632', '154234', '245970', '319040', '319049', '319053', '319126']
nosy_count = 6.0
nosy_names = ['ncoghlan', 'bethard', 'paul.j3', 'oxplot', 'John Jones', 'miss-islington']
pr_nums = ['7527', '7528', '7530', '7553']
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = '11874'
type = 'behavior'
url = 'https://bugs.python.org/issue14046'
versions = ['Python 2.7']