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试图在他的书用 Kivy 创建应用程序中查看天气应用程序。我目前遇到一个我不知道如何解决的错误。

我得到以下信息error：

city, country = data_item ValueError: 太多值无法解压

感谢任何帮助解决此错误

蟒蛇代码：

from kivy.app import App

from kivy.network.urlrequest import UrlRequest
import json

from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty, ListProperty
from kivy.uix.listview import ListItemButton
from kivy.factory import Factory   

class LocationButton(ListItemButton):
    location = ListProperty()    

class AddLocationForm(BoxLayout):
    search_results = ObjectProperty()
    search_input = ObjectProperty()

    def args_converter(self, index, data_item):    
        city, country = data_item    
        return {'location':(city, country)}   

    def search_location(self):
        search_template = "http://api.openweathermap.org/data/2.5/find?q={}&type=like&APPID=" + "a3ce4c4c978cae4ace6c3e404899ac32"

        search_url = search_template.format(self.search_input.text)
        request = UrlRequest(search_url, self.found_location)

        #TODO : Error Checking if location is not found

    def found_location(self, request, data):
        data = json.loads(data.decode()) if not isinstance(data, dict) else data    

        cities = ["{}({})".format(d['name'], d['sys']
                                  ['country']) for d in data['list']]   

        self.search_results.item_strings = cities
        del self.search_results.adapter.data[:]
        self.search_results.adapter.data.extend(cities)
        self.search_results._trigger_reset_populate()   

        #TODO: Error checking if network failure

class WeatherRoot(BoxLayout):
    current_weather = ObjectProperty()

    def show_current_weather(self, location):

        self.clear_widgets()

        if location is None and self.current_weather is None:
            location = ("New York (US)", "US")

        if location is not None:
            self.current_weather = Factory.CurrentWeather()
            self.current_weather.location = location

        self.add_widget(self.current_weather)

    def show_add_location_form(self):
        self.clear_widgets()
        self.add_widget(AddLocationForm())

class WeatherApp(App):
    pass    

if __name__ == '__main__':
    WeatherApp().run()

基维文件：

#: import main weather
#: import ListAdapter kivy.adapters.listadapter.ListAdapter

WeatherRoot:

<WeatherRoot>:    
    AddLocationForm:

<AddLocationForm>:
    orientation: 'vertical'
    search_input: search_box
    search_results: search_results_list

    BoxLayout:
        height: '40dp'
        size_hint_y: None

        TextInput:
            id: search_box
            size_hint_x: 50
            focus: True
            multiline: False
            on_text_validate: root.search_location()

        Button:
            text: 'Search'
            size_hint_x: 25   

            on_press: root.search_location()
        Button:
            text: 'Current Location'
            size_hint_x: 25

    ListView:
        id: search_results_list
        adapter:
            ListAdapter (data = [], cls= main.LocationButton,
            args_converter = root.args_converter)
    Button:
        text: 'Cancel'
        size_hint_y: None
        height: '40dp'
        on_press: app.root.show_current_weather(None)

<LocationButton>:
    text: "{} ({})".format(self.location[0], self.location[1])
    height: "40dp"
    size_hint_y: None
    on_press: app.root.show_current_weather(self.location)

<CurrentWeather@BoxLayout>:
    location: ['New York', 'US']
    conditions: None
    temp: None
    temp_min: None
    temp_max: None
    orientation: "vertical"
    Label:
        text: "{} ({})".format(root.location [0], root.location[1])
    BoxLayout:
        orientation: 'horizontal'
        size_hint_y: None
        height: '40dp'
        Button:
            text: 'Add Location'
            on_press: app.root.show_add_location_form()
        Button:
            text: "Forecast"
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1 回答 1

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我能够弄清楚自己。我正在将一个字符串传递给 args_converter；但我需要传递一个元组。下面的代码将修复上面的代码。

cities = [(d['name'], d['sys']['country']) for d in data['list']]
于 2016-09-11T02:16:54.910 回答