Hello all,

I have a question which might be simple or need some work around.

I want to do something like this. My class/instance has a dict as a
property. I want the instance to catch the change in the dict (change
in some values, addition/deletion of key/value etc) to be recognized by
the class instance.

How can I do this? Any suggestions are very well appreciated.



Here is an example of what I want my class to behave:

class test(object):
def __init__(self):
self._d = {}
self._changed = False
def getd(self):
print 'called getd'
return self._d
# dont know what to do next
def setd(self,val):
print 'called setd', key, val
self._d[key] = val
self._changed = True
d = property(getd,setd,None,None)

def getc(self):
return self._changed
changed = property(getc,None,None,None)

if __name__ == '__main__':
obj = test()
print 'obj.changed = ', obj.changed
print

# I want obj to know that its propety d being changed here
print "t.d['a'] = 1"
obj.d['a'] = 1
print

# I want the "changed" property to be True
print 'obj.changed = ', obj.changed









--
yosuke kimura
Center for Energy and Environmental Resources
The Univ. of Texas at Austin, USA