__length_hint__() of bytearray iterator can return negative integer

[serhiy-storchaka]

BPO	27443
Nosy	@rhettinger, @serhiy-storchaka
Files	bytearray_iterator_length_hint.patch

^{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 2016-07-03.12:18:19.108>
created_at = <Date 2016-07-02.19:53:54.043>
labels = ['interpreter-core', 'type-bug']
title = '__length_hint__() of bytearray iterator can return negative integer'
updated_at = <Date 2016-07-03.12:18:19.107>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2016-07-03.12:18:19.107>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2016-07-03.12:18:19.108>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2016-07-02.19:53:54.043>
creator = 'serhiy.storchaka'
dependencies = []
files = ['43612']
hgrepos = []
issue_num = 27443
keywords = ['patch']
message_count = 4.0
messages = ['269729', '269735', '269761', '269764']
nosy_count = 3.0
nosy_names = ['rhettinger', 'python-dev', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue27443'
versions = ['Python 3.5', 'Python 3.6']

[serhiy-storchaka]

>>> ba = bytearray(b'ab')
>>> it = iter(ba)
>>> next(it)
97
>>> ba.clear()
>>> list(it)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: __length_hint__() should return >= 0

Proposed patch fixes this issue.

[rhettinger]

This patch looks correct. Nice catch.

[python-dev]

New changeset 6b084bb6c38b by Serhiy Storchaka in branch '3.5':
Issue bpo-27443: __length_hint__() of bytearray itearator no longer return
https://hg.python.org/cpython/rev/6b084bb6c38b

New changeset 03192909160d by Serhiy Storchaka in branch 'default':
Issue bpo-27443: __length_hint__() of bytearray itearator no longer return
https://hg.python.org/cpython/rev/03192909160d

[serhiy-storchaka]

Thanks Raymond.