New submission from Serhiy Storchaka:
Originally PEP 3101 defined the default __format__ implementation,
object.__format__ as
def __format__(self, format_spec):
return format(str(self), format_spec)
After few changes (issue7994, issue28385) it now looks as
def __format__(self, format_spec):
assert format_spec == ''
return format(str(self), '')
Proposed patch makes it yet simpler:
def __format__(self, format_spec):
assert format_spec == ''
return str(self)
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 issue28385 and the discussion on Python-Dev:
https://mail.python.org/pipermail/python-dev/2016-October/146765.html.
----------
components: Interpreter Core
files: simpler-object-__format__.patch
keywords: patch
messages: 283220
nosy: eric.smith, serhiy.storchaka
priority: normal
severity: normal
stage: patch review
status: open
title: Make default __format__ be equivalent to __str__
type: enhancement
versions: Python 3.7
Added file: http://bugs.python.org/file45902/simpler-object-__format__.patch
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<http://bugs.python.org/issue28974>
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