old_value property

old_value property

The return value depends on type. For “attributes”, it is the value of the changed attribute before the change. For “characterData”, it is the data of the changed node before the change. For “childList”, it is null.

Definition:

@property
def old_value(self):
    ...
@old_value.setter
def old_value(self, value):
    ...

See Also