Real world example about how to use property feature in python?

I am interested in how to use @property in Python. I've read the python docs and the example there, in my opinion, is just a toy code:

class C(object):
    def __init__(self):
        self._x = None

    @property
    def x(self):
        """I'm the 'x' property."""
        return self._x

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

    @x.deleter
    def x(self):
        del self._x

I do not know what benefit(s) I can get from wrapping the _x filled with the property decorator. Why not just implement as:

class C(object):
    def __init__(self):
        self.x = None

I think, the property feature might be useful in some situations. But when? Could someone please give me some real-world examples?

Thanks.