Hong Xu added the comment:
Thanks for your answer, but I believe this is a real document bug. OSError does
have its signature documented, but the majority of other exception classes do
not do so, neither does BaseException explains a default behavior clearly (see
my quote above).
As an exam
Brett Cannon added the comment:
OSError does have its constructor documented at
https://docs.python.org/3/library/exceptions.html#OSError (farther down the
page I think you're reading; you didn't provide the URL you're referring to so
I'm somewhat guessing). It is specifically vague because
New submission from Hong Xu :
The "Builtin Exceptions" page does not document the constructors of the listed
exception classes. All it says is
> The tuple of arguments given to the exception constructor. Some built-in
> exceptions (like OSError) expect a certain number of arguments and assign
