Misleading error when initing ImportError

[SebastianKreft]

BPO	25142
Nosy	@brettcannon, @berkerpeksag
Superseder	bpo-21578: Misleading error message when ImportError called with invalid keyword args

^{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 2015-09-16.17:20:42.417>
created_at = <Date 2015-09-16.14:48:47.921>
labels = ['interpreter-core', 'type-feature']
title = 'Misleading error when initing ImportError'
updated_at = <Date 2015-09-16.17:20:42.415>
user = 'https://bugs.python.org/SebastianKreft'

bugs.python.org fields:

activity = <Date 2015-09-16.17:20:42.415>
actor = 'berker.peksag'
assignee = 'none'
closed = True
closed_date = <Date 2015-09-16.17:20:42.417>
closer = 'berker.peksag'
components = ['Interpreter Core']
creation = <Date 2015-09-16.14:48:47.921>
creator = 'Sebastian Kreft'
dependencies = []
files = []
hgrepos = []
issue_num = 25142
keywords = []
message_count = 3.0
messages = ['250850', '250854', '250856']
nosy_count = 3.0
nosy_names = ['brett.cannon', 'berker.peksag', 'Sebastian Kreft']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '21578'
type = 'enhancement'
url = 'https://bugs.python.org/issue25142'
versions = ['Python 3.4', 'Python 3.5', 'Python 3.6']

[SebastianKreft]

ImportError now supports the keyword arguments name and path. However, when passing invalid keyword arguments, the reported error is misleading, as shown below.

In [1]: ImportError('lib', name='lib')
Out[1]: ImportError('lib')

In [2]: ImportError('lib', name='lib', foo='foo')
---------------------------------------------------------------------------

TypeError                                 Traceback (most recent call last)
<ipython-input-2-5af12651187f> in <module>()
----> 1 ImportError('lib', name='lib', foo='foo')

TypeError: ImportError does not take keyword arguments

[brettcannon]

I bet it's because of https://hg.python.org/cpython/file/tip/Objects/exceptions.c#l64 which is called by https://hg.python.org/cpython/file/tip/Objects/exceptions.c#l643 .

[berkerpeksag]

Thanks for the report. This is a duplicate of bpo-21578.