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)

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)

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__