Provide suggestions for invalid keyword arguments

Ideas
1

Since the latest versions, the interpreter has provided suggestions in case of NameError or AttributeError. This is very helpful.

I suggest to add another kind of suggestions for invalid keyword arguments.

>>> s = 'abcd'
>>> s.split(',', maxplit=1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
    s.split(',', maxplit=1)
    ~~~~~~~^^^^^^^^^^^^^^^^
TypeError: 'maxplit' is an invalid keyword argument for split()
>>>

The error message could be completed as

TypeError: 'maxplit' is an invalid keyword argument for split(). Did you mean: 'maxsplit'?
2 Likes
2

So the good news is Pablo used his time machine to mostly already implement this feature: gh-107944: Improve error message for function calls with bad keyword arguments by pablogsal · Pull Request #107969 · python/cpython · GitHub

(The bad news is it looks like that only implements it for pure Python, so doesn’t trigger for str.split, but that seems fixable)

7 Likes
3

Let’s make str.split offer suggestions as well:

5 Likes
4

Thanks @hauntsaninja !

I tested with Python 3.13 but only with str.split(), the feature is actually already implemented for user-defined functions.