When using property, use a class that inherits object (new-style class)

If not new-style class

class Hoge:
    def __init__(self):
        self._x = 1

    @property
    def x(self):
        print 'property', self._x
        return self._x

    @x.setter
    def x(self, x):
        print 'setter'
        self._x = x

a = Hoge()
print a.x

a.x = 2
print a.x

result##

property 1
1
2

For new-style class

class Hoge(object):
    def __init__(self):
        self._x = 1

    @property
    def x(self):
        print 'property', self._x
        return self._x

    @x.setter
    def x(self, x):
        print 'setter'
        self._x = x

a = Hoge()
print a.x

a.x = 2
print a.x

result##

property 1
1
setter
property 2
2

reference##

• http://www.gesource.jp/weblog/?p=643