Remove support of format_string as keyword argument in string.Formatter().format()

[serhiy-storchaka]

BPO	29193
Nosy	@serhiy-storchaka
PRs	[Do Not Merge] Convert Misc/NEWS so that it is managed by towncrier #552
Files	string_formatter_positional_only.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 2017-01-13.07:11:32.543>
created_at = <Date 2017-01-07.11:35:11.513>
labels = ['3.7', 'type-feature', 'library']
title = 'Remove support of format_string as keyword argument in string.Formatter().format()'
updated_at = <Date 2017-03-31.16:36:07.881>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2017-03-31.16:36:07.881>
actor = 'dstufft'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2017-01-13.07:11:32.543>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2017-01-07.11:35:11.513>
creator = 'serhiy.storchaka'
dependencies = []
files = ['46189']
hgrepos = []
issue_num = 29193
keywords = ['patch']
message_count = 2.0
messages = ['284907', '285363']
nosy_count = 2.0
nosy_names = ['python-dev', 'serhiy.storchaka']
pr_nums = ['552']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue29193'
versions = ['Python 3.7']

[serhiy-storchaka]

Passing a format string as a keyword argument to string.Formatter.format() was deprecated in 3.5 (bpo-23671). Proposed patch finishes the deprecation period and converts a warning to an error.

Python 3.5-3.6:

>>> string.Formatter().format(format_string='foo: {foo}', foo=123)
__main__:1: DeprecationWarning: Passing 'format_string' as keyword argument is deprecated
'foo: 123'

Python 3.7:

>>> string.Formatter().format(format_string='foo: {foo}', foo=123)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/serhiy/py/cpython/Lib/string.py", line 179, in format
    "argument: 'format_string'") from None
TypeError: format() missing 1 required positional argument: 'format_string'

[python-dev]

New changeset d571d8cd4258 by Serhiy Storchaka in branch 'default':
Issue bpo-29193: A format string argument for string.Formatter.format()
https://hg.python.org/cpython/rev/d571d8cd4258