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Make default __format__ be equivalent to __str__ #73160
Description
| BPO | 28974 |
|---|---|
| Nosy | @rhettinger, @ericvsmith, @serhiy-storchaka |
| PRs | object.__format__(x, '') is now equivalent to str(x) #506 |
| Files |
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 2017-05-13.09:41:23.437>
created_at = <Date 2016-12-14.21:52:10.509>
labels = ['interpreter-core', 'type-feature', '3.7']
title = 'Make default __format__ be equivalent to __str__'
updated_at = <Date 2017-05-13.09:41:23.436>
user = 'https://github.com/serhiy-storchaka'bugs.python.org fields:
activity = <Date 2017-05-13.09:41:23.436>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2017-05-13.09:41:23.437>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2016-12-14.21:52:10.509>
creator = 'serhiy.storchaka'
dependencies = []
files = ['45902']
hgrepos = []
issue_num = 28974
keywords = ['patch']
message_count = 4.0
messages = ['283220', '293605', '293607', '293609']
nosy_count = 3.0
nosy_names = ['rhettinger', 'eric.smith', 'serhiy.storchaka']
pr_nums = ['506']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue28974'
versions = ['Python 3.7']
Activity
serhiy-storchaka commentedon Dec 14, 2016
Originally PEP-3101 defined the default __format__ implementation, object.__format__ as
After few changes (bpo-7994, bpo-28385) it now looks as
Proposed patch makes it yet simpler:
This is equivalent to the previous form except obscure case when str() returns not exact str, but strict subclass with overridden __format__.
The benefit of this change is simpler semantical model of the default implementation.
See the start of the discussion in bpo-28385 and the discussion on Python-Dev: https://mail.python.org/pipermail/python-dev/2016-October/146765.html.
serhiy-storchaka commentedon May 13, 2017
What are your thoughts about this Eric?
ericvsmith commentedon May 13, 2017
I'm okay with this change.
serhiy-storchaka commentedon May 13, 2017
New changeset 7e19dbc by Serhiy Storchaka in branch 'master':
bpo-28974:
object.__format__(x, '')is now equivalent tostr(x)(#506)7e19dbc