Example code:
class A:
def __init__(self, prop=0):
self.__prop = prop
@property
def prop(self):
return self.__prop
@prop.setter
def prop(self, value):
self.__prop = value
class B(A):
@A.prop.setter
def prop(self, value):
print("Setting new value",value)
super().prop = value
b = B(0)
b.prop=10
Result:
Setting new value 10
Traceback (most recent call last):
File "test.py", line 22, in <module>
b.prop=10
File "test.py", line 18, in prop
super().prop = value
AttributeError: 'super' object has no attribute 'prop'
This seems to be working:
class B(A):
@A.prop.setter # MAGIC HERE!
def prop(self, value):
print("Setting new value",value)
A.prop.fset(self, value) # MAGIC HERE!
How can I remove the magic? E.g. referencing the base class name
directly, and using some internal name "fset"?
Also, consider this:
class A:
def __init__(self, prop=0):
self.__prop = prop
@property
def prop(self):
return self.__prop
@prop.setter
def prop(self, value):
self.__prop = value
class B(A):
@A.prop.setter
def prop(self, value):
print("Setting new value in B:",value)
A.prop.fset(self, value) # How use the MRO here?
class C(A):
@A.prop.setter
def prop(self, value):
print("Setting new value in C:",value)
A.prop.fset(self, value) # How use the MRO here?
class D(B,C):
pass
d = D(0)
d.prop=10
Result:
Setting new value in B: 10
What if I want to use the "property setter of the superclass"? E.g. the
one that is the next in the MRO?
Thanks,
Laszlo
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