__init__ is not invoked

[ast]

Hello

In the following code found here:
https://www.pythonsheets.com/notes/python-object.html

__init__ is not invoked when we create an object
with "o = ClassB("Hello")". I don't understand why.
I know the correct way to define __new__ is to write
"return object.__new__(cls, arg)" and not "return object"


 >>> class ClassB(object):
...     def __new__(cls, arg):
...         print('__new__ ' + arg)
...         return object
...     def __init__(self, arg):
...         print('__init__ ' + arg)
...

 >>> o = ClassB("Hello")
__new__ Hello


Normaly, when running "o = ClassB("Hello")", we first run
__call__ from type of ClassB which is type. This __call__
method is supposed to launch __new__ from ClassB and then
__init__ from classB too. The output of __new__ is mapped
to self parameter of __init__.
But it seems things don't work like that here. Why ?