Python3 报错求指点
来源：3-2 如何实现可迭代对象和迭代器对象(2)
ArtistLea
2018-02-22
我的代码：
import requests
from collections import Iterable, Iterator
class WeatherIterator(Iterator):
def __init__(self,cities):
self.cities = cities
self.index = 0
def getWeather(self,city):
r = requests.get(u'http://wthrcdn.etouch.cn/weather_mini?city=' + city)
data = r.json()['data']['forecast'][0]
return '%s: %s, %s %s' % (city,data['low'], data['high'],data['date'])
def __next__(self):
if self.index == len(self.cities):
raise StopIteration
city = self.cities[self.index]
self.index += 1
return self.getWeather(city)
class WeatherIterable(Iterable):
def __init__(self,cities):
self.cities = cities
def __iter__(self):
return WeatherIterable(self.cities)
for x in WeatherIterable([u'北京', u'上海', u'邯郸', u'西安']):
print(x)
报错log：
Traceback (most recent call last):
File "C:/Users/Artist/PycharmProjects/Artist/1. Python 高效实例/2-1 如何在列表，字段，集合中根据条件筛选数据.py", line 26, in <module>
for x in WeatherIterable([u'北京', u'上海', u'邯郸', u'西安']):
TypeError: iter() returned non-iterator of type 'WeatherIterable'
1回答
-
ArtistLea
提问者
2018-02-22
汗。。自己书写错误。
以下可在Py3中执行。
import requests
from collections import Iterable, Iterator
class WeatherIterator():
def __init__(self,cities):
self.cities = cities
self.index = 0
def getWeather(self,city):
r = requests.get(u'http://wthrcdn.etouch.cn/weather_mini?city=' + city)
data = r.json()['data']['forecast'][0]
return '%s: %s, %s %s' % (city,data['low'], data['high'],data['date'])
def __next__(self):
if self.index == len(self.cities):
raise StopIteration
city = self.cities[self.index]
self.index += 1
return self.getWeather(city)
class WeatherIterable():
def __init__(self,cities):
self.cities = cities
def __iter__(self):
return WeatherIterator(self.cities)
for x in WeatherIterable(['北京', '上海', '邯郸', '西安']):
print(x)00
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