how to create nicer variable interface in python class -

i want variable more set when set it. , interface clean possible.

short: i'd want:

# have class variable can access: print myinstance.var 42 # change variable myinstance.var = 23 # have change kick off method: self.var changed: 23!! 

hmm.. can do: use variable , setter method:

class test:     def __init__(self):         self.var = 1         print( 'self.var is: ' + str(self.var) )     def setvar(self, value):         self.var = value         print( 'self.var changed: ' + str(self.var) )  t = test() self.var is: 1  # have t.var @ hand: print t.var 1  # , change way t.setvar(5) self.var changed: 5 

but have 2 different things work with.. ok make method interact var:

class test:     def __init__(self):         self.var = 1         print( 'self.var is: ' + str(self.var) )     def method(self, value=none):         if value == none:             return self.var         self.var = value         print( 'self.var changed: ' + str(self.var) )  t = test() self.var is: 1 # value then: print t.method() 1 # set it: t.method(4) self.var changed: 4 # , verifiy: print t.method() 4 

this nice already. i've seen in different post on other languages. dunno. there better solution in python?!?

maybe i'm paranoid but me it'd feel nicer t.var = 5 , have kicked off too.

i think want python properties. check this out. like:

class test:     def __init__(self):         self._var = 1      @property     def var(self):         return self._var      @var.setter     def var(self, value):         # add stuff here want happen on var assignment         self._var = value