[issue42978] Improve error message when "self" is missing from the method definition

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

> I use the same heuristic as Pypy: the callable is a bound method, the first name in the definition is not named "self" and it was called with n+1 positional arguments.

Okay, that makes sense, you could have said so in the bug or PR description. :-)

Do you also exclude class and static methods?

I still worry that this might confuse users when a library for some reason uses a different name than 'self'.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42978>
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