observable properties doesn't work with python 3.5 #16
Description
This is largely discussed at your answer on StackOverflow, but I'll summarize here.
Using the @observableMethod decorator on a method that is part of a property doesn't work in (c)python 3.5. Some problem occurs when the property is correctly bound to the class instance. For example,
class Bar(object):
def __init__(self):
self._bbb = "bar"
@property
def bbb(self):
return self._bbb
@bbb.setter
@observable_method
def setbbb(self, value):
self._bbb = valuewill cause the following error when you create an instance of Bar and try to set bar.bbb
Traceback (most recent call last):
File "", line 1, in
TypeError: 'ObservableMethodManager_PersistOnInstances' object is not callable
Using explicit properties as below causes the same issue:
class Bar(object):
def __init__(self):
self._bbb = "bar"
def getbbb(self):
return self._bbb
@observable_method
def setbbb(self, value):
self._bbb = value
bbb = property(getbbb, setbbb)Interestingly, a hackneyed attempt where the property is completely distinct from the class doesn't have the issue. The following works:
class Bar(object):
def __init__(self):
self._bbb = "bar"
def getbbb(self):
return self._bbb
@observable_method
def setbbb(self, value):
self._bbb = value
b = Bar()
prop = property(Bar.getbbb)
prop = prop.setter(Bar.setbbb)
def cb(val):
print("Called, {0}".format(val))
b.setbbb.add_observer(cb)
# >>> True
prop.__get__(b)
# >>> 'bar'
prop.__set__(b, 'BAR')
# >>> Called, BAR
b._bbb
# >>> 'BAR'