python不可迭代对象_TypeError:“type”对象不可迭代-正在迭代对象实例

据我所知，通过使用元类使类对象变得可iterable工作得很好：from __future__ import print_function

class IterableCar(type):

def __iter__(cls):

return iter(cls.__name__)

class Car(object):

__metaclass__ = IterableCar

def __init__(self, name):

self.name = name

if __name__=='__main__':

car1 = Car('Mercedes')

car2 = Car('Toyota')

for cars in Car:

print (cars)

结果：mgilson$ python ~/sandbox/test.py

C

a

r

下面是一个我实际跟踪生成的汽车的示例：from __future__ import print_function

import weakref

class IterableCar(type):

_cars = weakref.WeakSet()

def __iter__(cls):

return iter(cls._cars)

def add_car(cls, car):

cls._cars.add(car)

class Car(object):

__metaclass__ = IterableCar

def __init__(self, name):

self.__class__.add_car(self)

self.name = name

if __name__=='__main__':

car1 = Car('Mercedes')

car2 = Car('Toyota')

for cars in Car:

print (cars.name)

请注意，如果使用python3.x，要使用元类，需要执行以下操作：class Car(metaclass=IterableCar):

...

而不是：class Car(object):

__metaclass__ = IterableCar

这可能解释了你正在经历的问题。