There are some basics about Python objects I don't understand.
Consider this snippet:

class X: pass
...
x = X()
dir(x)
['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__']
x.foo = 11

And now I want to make a simple object in a shorter way, without declaring X class:

y = object()
dir(y)
['__class__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__', '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__']
y.foo = 12
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
AttributeError: 'object' object has no attribute 'foo'

The attribute list is different now and there's no __dict__ and the object does not accept new attributes.
Please explain what's going on.

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