inspect.signature() doesn't support partialmethod without explicit self parameter

[serhiy-storchaka]

BPO	30149
Nosy	@rhettinger, @ncoghlan, @serhiy-storchaka, @1st1, @corona10
PRs	bpo-30149: Fix partialmethod without explicit self parameter. #1308 [3.6] bpo-30149: Fix partialmethod without explicit self parameter (#1308) #1662 [3.5] bpo-30149: Fix partialmethod without explicit self parameter (#1308) #1663

^{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 2017-06-15.14:44:19.469>
created_at = <Date 2017-04-23.20:18:25.285>
labels = ['3.7', 'type-bug', 'library']
title = "inspect.signature() doesn't support partialmethod without explicit self parameter"
updated_at = <Date 2017-06-15.14:44:19.468>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2017-06-15.14:44:19.468>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2017-06-15.14:44:19.469>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2017-04-23.20:18:25.285>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 30149
keywords = []
message_count = 5.0
messages = ['292184', '292380', '293877', '296101', '296102']
nosy_count = 5.0
nosy_names = ['rhettinger', 'ncoghlan', 'serhiy.storchaka', 'yselivanov', 'corona10']
pr_nums = ['1308', '1662', '1663']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue30149'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7']

[serhiy-storchaka]

>>> import functools, inspect
>>> class A:
...     f = functools.partialmethod((lambda self, x, y, *args: ...), 1)
... 
>>> inspect.signature(A.f)
<Signature (self, y, *args)>
>>> class A:
...     f = functools.partialmethod((lambda *args: ...), 1)
... 
>>> inspect.signature(A.f)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/serhiy/py/cpython/Lib/inspect.py", line 3007, in signature
    return Signature.from_callable(obj, follow_wrapped=follow_wrapped)
  File "/home/serhiy/py/cpython/Lib/inspect.py", line 2757, in from_callable
    follow_wrapper_chains=follow_wrapped)
  File "/home/serhiy/py/cpython/Lib/inspect.py", line 2227, in _signature_from_callable
    return sig.replace(parameters=new_params)
  File "/home/serhiy/py/cpython/Lib/inspect.py", line 2780, in replace
    return_annotation=return_annotation)
  File "/home/serhiy/py/cpython/Lib/inspect.py", line 2725, in __init__
    raise ValueError(msg)
ValueError: duplicate parameter name: 'args'

[corona10]

I submitted the PR for this issue.

[1st1]

New changeset 378d706 by Yury Selivanov (Dong-hee Na) in branch 'master':
bpo-30149: Fix partialmethod without explicit self parameter (bpo-1308)
378d706

[serhiy-storchaka]

New changeset e45ea37 by Serhiy Storchaka (Dong-hee Na) in branch '3.6':
bpo-30149: Fix partialmethod without explicit self parameter (bpo-1308) (bpo-1662)
e45ea37

[serhiy-storchaka]

New changeset fb0825c by Serhiy Storchaka (Dong-hee Na) in branch '3.5':
bpo-30149: Fix partialmethod without explicit self parameter (bpo-1308) (bpo-1663)
fb0825c