New submission from Kevin Rocard:
Extracted from xml.dom.minidom:
~~~
Node(...):
...
ownerDocument = None
...
Element(Node):
__slots__=('ownerDocument', ...)
...
~~~
As Element declares an ownerDocument attribute in __slots__, Node's
ownerDocument attribute is hidden:
~~~
class B: b=1;
class D(B): __slots__={'b'}
D().b -> AttributeError
~~~
This leads to a strange behaviour were accessing a base attribute fails with an
attribute error.
Should the Node.ownerDocument attribute not be removed?
Or its name removed from the Element.__slots__ list?
Ie have the attribute in the base or the derivative, but not both.
Independent note: <https://docs.python.org/3/reference/datamodel.html#slots>
says:
> When inheriting from a class without __slots__ [Node], the __dict__ attribute
> of that class will always be accessible, so a __slots__ definition in the
> subclass [Element] is meaningless.
So as for as I understand Element.__slots__ does not reduce the Element()
footprint (it was introduced for that).
----------
components: Library (Lib)
messages: 235700
nosy: krocard
priority: normal
severity: normal
status: open
title: xml.dom.minidom.Element.ownerDocument is hiden
type: enhancement
versions: Python 3.4
_______________________________________
Python tracker <[email protected]>
<http://bugs.python.org/issue23436>
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