method with special keyword-only argument gives error

[florentx]

BPO	14607
Nosy	@ncoghlan, @benjaminp, @florentx

^{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 2012-04-17.23:54:30.430>
created_at = <Date 2012-04-17.21:28:15.762>
labels = ['interpreter-core', 'type-bug']
title = 'method with special keyword-only argument gives error'
updated_at = <Date 2012-04-17.23:54:41.248>
user = 'https://github.com/florentx'

bugs.python.org fields:

activity = <Date 2012-04-17.23:54:41.248>
actor = 'python-dev'
assignee = 'none'
closed = True
closed_date = <Date 2012-04-17.23:54:30.430>
closer = 'python-dev'
components = ['Interpreter Core']
creation = <Date 2012-04-17.21:28:15.762>
creator = 'flox'
dependencies = []
files = []
hgrepos = []
issue_num = 14607
keywords = []
message_count = 3.0
messages = ['158568', '158578', '158579']
nosy_count = 4.0
nosy_names = ['ncoghlan', 'benjamin.peterson', 'flox', 'python-dev']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue14607'
versions = ['Python 3.2', 'Python 3.3']

[florentx]

This is probably a bug.

>>> class A:
...   def f(self, __a=42):
...     pass
... 
>>> A().f()
>>> class A:
...   def f(self, *, __a=42):
...     pass
... 
>>> A().f()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: f() needs keyword-only argument _A__a

[python-dev]

New changeset f8540b8d076c by Benjamin Peterson in branch '3.2':
mangle keyword-only argname when loading defaults (closes bpo-14607)
http://hg.python.org/cpython/rev/f8540b8d076c

[python-dev]

New changeset 22844ddce57b by Benjamin Peterson in branch 'default':
merge 3.2 (bpo-14607)
http://hg.python.org/cpython/rev/22844ddce57b