Alternate constructors bytes.fromhex() and bytearray.fromhex() return an instance of base type

[serhiy-storchaka]

BPO	27007
Nosy	@birkenfeld, @serhiy-storchaka
Files	bytes_fromhex.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 = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2016-07-01.14:23:58.898>
created_at = <Date 2016-05-12.08:03:18.898>
labels = ['interpreter-core', 'type-feature']
title = 'Alternate constructors bytes.fromhex() and bytearray.fromhex() return an instance of base type'
updated_at = <Date 2016-07-01.14:23:58.897>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2016-07-01.14:23:58.897>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2016-07-01.14:23:58.898>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2016-05-12.08:03:18.898>
creator = 'serhiy.storchaka'
dependencies = []
files = ['42826']
hgrepos = []
issue_num = 27007
keywords = ['patch']
message_count = 4.0
messages = ['265375', '265387', '269026', '269672']
nosy_count = 3.0
nosy_names = ['georg.brandl', 'python-dev', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue27007'
versions = ['Python 3.6']

[serhiy-storchaka]

According to the discussion on Python-Dev [1] alternate constructors should return an instance of the subclass (else why invoke it through the subclass). bytes.fromhex() and bytearray.fromhex() are the only exceptions.

I think bytes.fromhex() and bytearray.fromhex() should be changed to match the behavior of all other alternate constructors.

[1] http://comments.gmane.org/gmane.comp.python.devel/157649

[serhiy-storchaka]

Here is a patch.

[serhiy-storchaka]

Ping.

[python-dev]

New changeset 62375fd21de8 by Serhiy Storchaka in branch 'default':
Issue bpo-27007: The fromhex() class methods of bytes and bytearray subclasses
https://hg.python.org/cpython/rev/62375fd21de8