Report details of excess arguments in object_new & object_init #75708

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1. ncoghlan commented on Sep 20, 2017

   

   ncoghlan

   on Sep 20, 2017

   ContributorAuthor

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   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

   bpo-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.
2. ncoghlan

   added

   type-featureA feature request or enhancementA feature request or enhancement

   on Sep 20, 2017
3. ncoghlan commented on Sep 20, 2017

   

   ncoghlan

   on Sep 20, 2017

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   Adding a dependency on bpo-31506, as this shouldn't be tackled until those simpler amendments are resolved.
4. serhiy-storchaka commented on Sep 20, 2017

   

   serhiy-storchaka

   on Sep 20, 2017

   Member

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   str(x=1) is not the best example since str() takes keyword arguments. Look at tuple() and list():

   >>> tuple(x=1)
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
   TypeError: tuple() takes no keyword arguments
   >>> list(x=1)
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
   TypeError: list() takes no keyword arguments

   Initial version of my patch for bpo-31506 reported error messages similar to tuple() and list(), but at end I simplified it since in any case the error message was not perfect.
5. ezio-melotti

   transferred this issue fromon Apr 10, 2022
6. iritkatriel

   added

   interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

   on Nov 23, 2023