[New-bugs-announce] [issue31527] Report details of excess arguments in object_new & object_init

[Nick Coghlan]

New submission from Nick Coghlan:

object_new and object_init currently use their own argument checking logic, and hence haven't benefited from the error reporting enhancements in PyArg_ParseTupleAndKeywords

Compare:

>>> str(1, 2, 3, 4, 5, x=1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: str() takes at most 3 arguments (6 given)
>>> str(x=1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'x' is an invalid keyword argument for this function

To:

>>> C(1, 2, 3, 4)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: object() takes no parameters
>>> C(x=1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: object() takes no parameters

Issue 31506 amends the latter to at least report the subclass name rather than the base class name, but doesn't cover any other enhancements, like reporting how many arguments were actually given, or the first unknown keyword argument name.

----------
messages: 302591
nosy: ncoghlan
priority: normal
severity: normal
stage: needs patch
status: open
title: Report details of excess arguments in object_new & object_init
type: enhancement

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31527>
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