[python 2.3.3, x86 linux, part of a substantial gtk/postgres app]
I want a Run instance to have a Status instance which inherits
from Observable. I want to be able to say:
thisrun.status = 'planned'
and have thisrun's _set_status do side-effects and then the status
object's setter incorporate the new value as it's new state.
But the setter functions never seem to get called.
Am I using "property" wrong?
class Observable: #("observer" software pattern)
def __init__(self):
self.observers = []
def register(self, func, *args, **kw):
self.observers.append((func, args, kw))
def notify(self):
for func, args, kw in self.observers: func(*args, **kw)
class RunStatus(Observable):
def __init__(self, val):
Observable.__init__(self)
self._value = val
def set(self, newval):
print 'RunStatus.set'
self._value = newval
self.notify()
def get(self):
print 'RunStatus.get'
return self._value
class Run:
def __init__(self):
self._status = RunStatus('planned')
def _get_status(self):
return self._status
def _set_status(self, val):
# do various things with val...
self._status.set(val)
status = property(_get_status, _set_status)
if __name__ == '__main__':
def stat_display():
print 'display to screen: r.status=', r.status
r = Run()
r.status.register(stat_display) #many registers in real app.
r.status='hold'
print 'status=', r.status
print r._status.observers
Status needs to be a real and persistant object so it's
observers persist, but needs it's value changed simply, like
r.status = 'something'
[flames about using string values for what is semantically a
six valued enum *are* welcome in a separate thread...] 3 1420
"george young" <gr*@ll.mit.edu> wrote in message
news:78**************************@posting.google.c om... [python 2.3.3, x86 linux, part of a substantial gtk/postgres app] I want a Run instance to have a Status instance which inherits from Observable. I want to be able to say:
thisrun.status = 'planned'
and have thisrun's _set_status do side-effects and then the status object's setter incorporate the new value as it's new state. But the setter functions never seem to get called. Am I using "property" wrong?
class Observable: #("observer" software pattern)
'property' only works with new-style classes. Try changing to
class Observable(object):
and also make the same change in class Run.
--
I don't actually read my hotmail account, but you can replace hotmail with
excite if you really want to reach me.
Also, property needs bound methods to get, set, and delete, like
status = property(self._get_status, self._set_status)
/Jean Brouwers
In article <78**************************@posting.google.com >, george
young <gr*@ll.mit.edu> wrote: [python 2.3.3, x86 linux, part of a substantial gtk/postgres app] I want a Run instance to have a Status instance which inherits from Observable. I want to be able to say:
thisrun.status = 'planned'
and have thisrun's _set_status do side-effects and then the status object's setter incorporate the new value as it's new state. But the setter functions never seem to get called. Am I using "property" wrong?
class Observable: #("observer" software pattern) def __init__(self): self.observers = [] def register(self, func, *args, **kw): self.observers.append((func, args, kw)) def notify(self): for func, args, kw in self.observers: func(*args, **kw)
class RunStatus(Observable): def __init__(self, val): Observable.__init__(self) self._value = val def set(self, newval): print 'RunStatus.set' self._value = newval self.notify() def get(self): print 'RunStatus.get' return self._value
class Run: def __init__(self): self._status = RunStatus('planned') def _get_status(self): return self._status def _set_status(self, val): # do various things with val... self._status.set(val) status = property(_get_status, _set_status)
if __name__ == '__main__': def stat_display(): print 'display to screen: r.status=', r.status r = Run() r.status.register(stat_display) #many registers in real app. r.status='hold' print 'status=', r.status print r._status.observers
Status needs to be a real and persistant object so it's observers persist, but needs it's value changed simply, like r.status = 'something'
[flames about using string values for what is semantically a six valued enum *are* welcome in a separate thread...]
Jean Brouwers wrote: Also, property needs bound methods to get, set, and delete, like
status = property(self._get_status, self._set_status)
/Jean Brouwers
No it doesn't. The following is a working piece of code:
class C(object):
def getx(self):
return 1
x = property(getx)
print C().x
Prints 1 as expected.
--
Shalabh This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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