如何在Kivy / Python中遍历JSON密钥以创建一个显示每个密钥属性的列表？

Question

我正在尝试创建一个屏幕，用户可以在其中输入3个MDTextField小部件，然后单击Submit在MDList中创建一个新项目（即基本任务跟踪器！）。现在，我可以使用以下代码提取为每个条目创建ThreeLineIconListItem。

.py

class TasksScreen(Screen) :
def get_date(self, date) :
    '''
    :type date: <class 'datetime.date'>
    '''
    self.ids.wiki_dateselected.text = str(date)

def show_date_picker(self) :
    date_dialog = MDDatePicker(callback=self.get_date)
    date_dialog.open()

def create_task(self):
    task_title = self.ids.i_wiki_tasktitle.text
    task_detail = self.ids.i_wiki_taskdetail.text
    task_deadline = self.ids.wiki_dateselected.text
    print('Task title is {}, task detail is {}, and task deadline is {}'.format(task_title, task_detail, task_deadline))
    self.ids.wiki_cardcontainer.add_widget(ThreeLineIconListItem(id = 'wikitask_{}'.format(task_title),
                                                                 text=task_title,
                                                                 secondary_text = task_detail,
                                                                 tertiary_text = task_deadline))

.kv

<TaskCard>
orientation: 'vertical'
spacing: '5dp'

MDLabel:
    id: wiki_cardtitle
MDLabel:
    id: wiki_carddetail
MDLabel:
    id: wiki_carddate


<TasksScreen>:
name: 'TasksScreen'

MDBoxLayout:
    orientation: 'horizontal'
    size_hint_y: 1

    MDBoxLayout:
        size_hint_x: 1
        orientation: 'vertical'
        ScrollView:
            id: note_scroll
            size_hint_x: .4

            MDCard:
                id: wiki_card_1
                orientation: 'vertical'
                spacing: 10
                MDLabel:
                    size_hint_y: None
                    text: 'Task Entry'
                    font_size: 40
                    halign: 'left'
                    md_bg_color: app.theme_cls.accent_light
                    elevation: 10

                MDLabel:
                    size_hint_y: None
                    text: 'Task Details'
                    font_size: 15
                    halign: 'left'

                MDTextField:
                    id: i_wiki_tasktitle
                    size_hint_y: None
                    hint_text: "Enter task title: "
                    mode: "rectangle"
                    multiline: False
                    required: True
                    color_mode: 'accent'
                    icon_right: "arrow-down-drop-circle-outline"
                    icon_right_color: app.theme_cls.accent_color

                MDTextField:
                    id: i_wiki_taskdetail
                    size_hint_y: None
                    hint_text: "Details of task: (max 200 chars.)"
                    mode: "rectangle"
                    multiline: True
                    max_text_length: 200
                    color_mode: 'accent'
                    icon_right: "arrow-down-drop-circle-outline"
                    icon_right_color: app.theme_cls.accent_color

                MDBoxLayout:
                    orientation: 'horizontal'
                    size_hint: (None, None)
                    height: self.minimum_height
                    width: root.ids.wiki_card_1.width
                    spacing: '20dp'

                    MDRaisedButton:
                        text: 'Select Deadline'
                        size_hint: (None, None)
                        halign: 'left'
                        height: '40dp'
                        md_bg_color: app.theme_cls.accent_light
                        on_release: root.show_date_picker()

                    MDLabel:
                        text: '[select date]'
                        id: wiki_dateselected
                        icon: 'calendar'
                        size_hint: (None, None)
                        height: '40dp'
                        width: '200dp'


                    MDLabel:
                        text: ''
                        size_hint_x: '0.4'

                MDRaisedButton:
                    text: 'Submit'
                    md_bg_color: app.theme_cls.accent_light
                    on_release: root.create_task()


        MDLabel:
            text: 'FILLER'
            elevation: 10
            size_hint: (None, 1)




    ScrollView:
        size_hint_x: .60
        MDList:
            id: wiki_cardcontainer

我现在想添加从应用程序的先前实例中加载先前创建的任务的功能，即我已经创建了一些任务，关闭了应用程序，现在再次打开了应用程序，并照原样重新创建了列表。我的初学者水平知识认为使用Kivy的JsonStore模块将是这样做的一种方式（如果我缺少更好的解决方案，请纠正我！）

在我看来，我想按照下面的代码片段进行操作，但是它返回一个NameError，指出““”“名称'task_detail'未定义”“”“

TaskStore = JsonStore("TaskStore.json")
class TasksScreen(Screen) :
    def on_enter(self, *args):
    TaskStore.put('EmptyCard', task_detail='Insert details here', task_deadline='Insert deadline here')
    for key in TaskStore.keys():
            self.ids.wiki_cardcontainer.add_widget(ThreeLineIconListItem(id='wikitask {}',
                                                                         text=str(TaskStore.get(key)),
                                                                         secondary_text=str(TaskStore.get(key)[task_detail]),
                                                                         tertiary_text=str(TaskStore.get(key)[task_deadline])))

任何有关如何使此工作正常运行的建议将不胜感激！