andrew cooke wrote:
>> But then nothing will be passed to __init__ on the subclass.
>>
>> Andrew
>
>>>> class Foo:
> ... def __new__(cls, *args, **kargs):
> ... print('new', args, kargs)
> ... super().__new__(cls)
> ...
>>>> class Bar(Foo):
> ... def __init__(self, a):
> ... print('init', a)
> ...
>>>> Bar(1)
> new (1,) {}
>
> no "init" is printed.
That's because yor __new__() returns None. Try
$ cat new_demo.py
class Foo:
def __new__(cls, *args, **kargs):
print('new', cls, args, kargs)
return super().__new__(cls)
class Bar(Foo):
def __init__(self, a):
print('init', a)
bar = Bar(42)
$ python3 new_demo.py
new <class '__main__.Bar'> (42,) {}
init 42
$
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