class Screen(object):

@property

def width(self):

return self._width

@width.setter

def width(self, val):

self._width = val

@property

def height(self):

return self._height

@height.setter

def height(self, val):

self._height = val

@height.deleter

def height(self):

del self._height

@property

def resolution(self):

return self._height * self._width

class Student(object):

def __init__(self, name):

self.name = name

def __str__(self):

return 'Student Object (name:%s)' % self.name

# __repr__ = __str__

class Fib(object):

def __init__(self):

self.a, self.b = 0, 1 # 初始化两个计数器a，b

def __iter__(self):

return self # 实例本身就是迭代对象，故返回自己

def __next__(self):

self.a, self.b = self.b, self.a + self.b # 计算下一个值

if self.a > 100000: # 退出循环的条件

raise StopIteration();

return self.a # 返回下一个值

class Chain(object):

def __init__(self, path=''):

self._path = path

def __getattr__(self, path):

return Chain('%s/%s' % (self._path, path))

def __call__(self, user):

return Chain('%s/%s' %(self._path, user))

def __str__(self):

return self._path

__repr__ = __str__

print(Chain().status.user('fuck').timeline.list)

# print(s)

# test:

# s = Screen()

# s.width = 1024

# s.height = 768

# print(s.resolution)

# s.height

# print(s.resolution)

# assert s.resolution == 786432, '1024 * 768 = %d ?' % s.resolution

# print(dir(s))