BPO | [30347](https://bugs.python.org/issue30347) --- | :--- Nosy | @arigo, @rhettinger, @serhiy-storchaka PRs | python/cpython#1557python/cpython#3770python/cpython#3772 *Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.* Show more details GitHub fields: ```python assignee = 'https://github.com/serhiy-storchaka' closed_at = created_at = labels = ['extension-modules', '3.7', 'type-crash'] title = 'itertools.groupby() can fail a C assert()' updated_at = user = 'https://github.com/arigo' ``` bugs.python.org fields: ```python activity = actor = 'serhiy.storchaka' assignee = 'serhiy.storchaka' closed = True closed_date = closer = 'serhiy.storchaka' components = ['Extension Modules'] creation = creator = 'arigo' dependencies = [] files = [] hgrepos = [] issue_num = 30347 keywords = ['patch'] message_count = 8.0 messages = ['293517', '293519', '293549', '293579', '302948', '303062', '303065', '303071'] nosy_count = 3.0 nosy_names = ['arigo', 'rhettinger', 'serhiy.storchaka'] pr_nums = ['1557', '3770', '3772'] priority = 'normal' resolution = 'fixed' stage = 'resolved' status = 'closed' superseder = None type = 'crash' url = 'https://bugs.python.org/issue30347' versions = ['Python 2.7', 'Python 3.6', 'Python 3.7'] ```