testing set getters/setters

import sys

class thing():
    def __init__(self):
        self._stuff = { 'foo', 'bar' }

    @property
    def foo(self):
        return True if sys._getframe().f_code.co_name in self._stuff else False

    @property
    def bar(self):
        return True if sys._getframe().f_code.co_name in self._stuff else False

    @foo.setter
    def foo(self, v):
        if v:
            self._stuff.add(sys._getframe().f_code.co_name)
        else:
            self._stuff.discard(sys._getframe().f_code.co_name)

    @bar.setter
    def bar(self, v):
        if v:
            self._stuff.add(sys._getframe().f_code.co_name)
        else:
            self._stuff.discard(sys._getframe().f_code.co_name)

    def __repr__(self):
        return ', '.join(x for x in self._stuff)

x = thing()
print('foo %s, bar %s' % (x.foo, x.bar))
x.foo = True
print('foo %s, bar %s' % (x.foo, x.bar))
x.foo = False
print('foo %s, bar %s' % (x.foo, x.bar))
x.bar = False
print('foo %s, bar %s' % (x.foo, x.bar))
x.foo = True
x.bar = True
print('foo %s, bar %s' % (x.foo, x.bar))

print(x)