Hello, I noticed an inconsistency in the error messages for the number of arguments to a method call. For Python methods, the "self" argument is counted. For built-in methods, the "self" argument is *not* counted:
class mylist(list): ... def append(self, val): super().append(val)
f = list().append f(1,2) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: append() takes exactly one argument (2 given)
g = mylist().append g(1,2) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: append() takes 2 positional arguments but 3 were given
I think it has been argued before that it's a feature that self is counted. So I consider the error message for list().append a bug. This is one of the many oddities I noticed while working on improving built-in functions. Would you agree to change the error message for built-in methods to be closer to Python methods? Jeroen.