Some pproperty/property tests

@property
def g(self):
  return self.x
g_id = hex(id(g))
h = g
assert(h == g)
assert(h is g)
@h.setter
def h(self, value):
  self.x = value
assert(h is not g)
assert(g_id == hex(id(g)))


@property
def g(self):
  return self.x
g_id = hex(id(g))
old_g = g
@g.setter
def g(self, value):
  self.x = value
assert(g_id != hex(id(g)))
assert(g is not old_g)
assert(g_id == hex(id(old_g)))


class A(object):
  x = property(lambda self: self._x)
  original_x_id = id(x)
  y = property(lambda self: self._y)
  original_y_id = id(y)
  @x.setter
  def x(self, value):
    self._x = value
assert(A.original_x_id != id(A.x))
assert(A.original_y_id == id(A.y))