class Pizza(object):　　def __init__(self, radius, height):　　　　self.radius = radius　　　　self.height = height　　@staticmethod　　def compute_area(radius):　　　　return math.pi * (radius**2)　　@classmethod　　def compute_volume(cls, height, radius):　　　　return height * cls.compute_area(radius)　　def get_volume(self):　　　　return self.compute_volume(self.height, self.radius)

yield (生产者&消费者模型)

def consumer():    r = ''    while True:        n = yield r        if not n:            return        print ('[CONSUME] Consuming %s...' %n)def produce(c):    c.send(None)    n = 0    while n<5:        n = n + 1        print ('[PRODUCER] Producting %s...' %n)        r = c.send(n)        print ('[PRODUCER] Consumer return: %s' %r)    c.closec = consumer()produce(c)

__getattr__ 链式调用

class Chain(object):    def __init__(self, path = ''):        self._path = path    def __getattr__(self, path):        return Chain('%s%s' %(self._path, path))    def __str__(self):        return self._path    __repr__ = __str__