python的property简单实用

class P(object):
    """
    must extend object
    """

    def __init__(self, v):
        self._v = v
    
    @property
    def v(self):
        return self._v
    
    @v.getter
    def v(self):
        print "gettter"
        return slef._v

    @v.setter
    def v(self, v):
        self._v = v

p = P(10)
print p.v
p.v = 100  #  AttributeError: can't set attribute
print p.v