Nick Coghlan added the comment:
Aye, the "C.__new__" example omitting the first arg was just an error in that
example.
And that's a good point about the current "object.__init__()" error message
actually being incorrect, since the *methods* each take exactly one argument -
it's only the "object(*args, **kwds)" form that genuinely expects zero
arguments.
If we were to correct that error as well, we'd end up with the following:
# Without any method overrides
class C:
pass
C(42) -> "TypeError: C() takes no arguments"
C.__new__(C, 42) -> "TypeError: C() takes no arguments"
C().__init__(42) -> "TypeError: C.__init__() takes exactly one argument"
# These next two quirks are the price we pay for the nicer errors above
object.__new__(C, 42) -> "TypeError: C() takes no arguments"
object.__init__(C(), 42) -> "TypeError: C.__init__() takes exactly one
argument"
# With method overrides
class D:
def __new__(cls, *args, **kwds):
super().__new__(cls, *args, **kwds)
def __init__(self, *args, **kwds):
super().__init__(*args, **kwds)
D(42) -> "TypeError: object.__new__() takes exactly one argument"
D.__new__(D, 42) -> "TypeError: object.__new__() takes exactly one argument"
D().__init__(42) -> "TypeError: object.__init__() takes exactly one
argument"
object.__new__(C, 42) -> "TypeError: object.__new__() takes exactly one
argument"
object.__init__(C(), 42) -> "TypeError: object.__init__() takes exactly one
argument"
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<https://bugs.python.org/issue31506>
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