# Its signature is: property(fget=None, fset=None, fdel=None, doc=None)
class MyClass(object):
def __init__(self, x):
assert isinstance(x, int), '"x" must be an integer!'
self.__x = ~x
def get_x(self):
return ~self.__x
x = property(get_x)
inst = MyClass('foo')
inst = MyClass(10)
print 'inst.x =', inst.x
inst.x = 20