只操作类的属性，不处理实例对象属性，无self方法函数。上边必须写@staticmethod，如果不写@staticmethod则方法被认为是实例方法，要求其第一个参数为self。静态方法可以通过类调用、实例调用触发。可被继承，子类或子类实例对象依然可以调用。
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class aa:
        x = 100
        def __init__(self):
                self.x = 10
                self.y = 12
        def hello(self, x):
                return x + 1
        @staticmethod
        def pr():
                print ‘aa class x ‘, aa.x
class bb(aa):
        def __init__(self):
                aa.__init__(self)
                self.z = 14
        
        
a = aa()
print a.x, a.y
a.pr()
aa.pr()
b = bb()
print b.x, b.y
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运行结果如下
10 12
aa class x 100
aa class x 100
10 12
aa class x 100
aa class x 100
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