杂记（python）

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.close
c = 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__