Kivy/PyMongo:在TextInput中使用'enter‘键将输入的笔记输入数据库

from kivy.app import App
from kivy.uix.textinput import TextInput
from kivy.uix.boxlayout import BoxLayout
from pymongo import MongoClient

class MyBoxLayout(BoxLayout):
    def __init__(self, **kwargs):
        super(MyBoxLayout, self).__init__(**kwargs)
        self.orientation = 'vertical'

        self.text_input = TextInput(multiline=False)
        self.text_input.bind(on_text_validate=self.on_enter)
        self.add_widget(self.text_input)

    def on_enter(self, instance):
        note = self.text_input.text

        # 连接MongoDB数据库
        client = MongoClient('mongodb://localhost:27017/')
        db = client['mydatabase']
        collection = db['notes']

        # 将笔记插入数据库
        collection.insert_one({'note': note})

        # 清空TextInput
        self.text_input.text = ''

class MyApp(App):
    def build(self):
        return MyBoxLayout()

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