test.py

Question

我有两个文件：test.py和test.kv。当我从insert_update_account()文件中调用.kv函数时，它会出错：

File "kivy/weakproxy.pyx", line 30, in kivy.weakproxy.WeakProxy.__getattr__ (kivy/weakproxy.c:1144)
   File "kivy/weakproxy.pyx", line 26, in kivy.weakproxy.WeakProxy.__ref__ (kivy/weakproxy.c:1043)
 ReferenceError: weakly-referenced object no longer exists<br/>

如果我对self.display_account()函数中的行insert_update_account()发表评论，则表示没有错误。

test.py

import kivy

kivy.require('1.9.0')  # replace with your current kivy version !
import sqlite3 as lite
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import BooleanProperty, ListProperty, StringProperty, ObjectProperty, NumericProperty
from kivy.lang import Builder

from kivy.core.window import Window
Window.maximize()


con = lite.connect('test.db')
#con = lite.connect(path + 'fact.db')
con.text_factory = str
cur = con.cursor()

class MainMenu(BoxLayout):


    def display_account(self):
        self.dropdown.dismiss()
        self.remove_widgets()
        self.rvaccount = TEST()
        self.content_area.add_widget(self.rvaccount)
        self.cur.close()
        self.con.close()

    def insert_update_account(self, obj):
        cur.execute("UPDATE table SET test1=?, test2=? WHERE test3=?",
                    (obj.col_data[1], obj.col_data[2], obj.col_data[0]))
        con.commit()
        self.display_account()


class TEST(BoxLayout):
    data_items = ListProperty([])
    col1 = ListProperty()
    col2 = ListProperty()

    mode = StringProperty("")

    def __init__(self, **kwargs):
        super(TEST, self).__init__(**kwargs)
        self.get_data()

    def update(self):
        self.col1 = [{'test1': str(x[0]), 'test2': str(x[1]), 'key': 'test1'} for x in self.data_items]
        self.col2 = [{'test1': str(x[0]), 'test2': str(x[1]), 'key': 'test2'} for x in self.data_items]


    def get_data(self):

        cur.execute("SELECT * from table")
        rows = cur.fetchall()
        print(rows)
        i = 0
        for row in rows:
            self.data_items_city.append([row[0], row[1], i])
            i += 1
        print(self.data_items_city)
        self.update()

class TestApp(App):
    title = "test"

    def build(self):
        self.root = Builder.load_file('test.kv')
        return MainMenu()



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

有人可以帮助我吗？

Answer 1

在我看来，您在类cur中混合了光标con和连接MainMenu，因为您已在全局范围内定义它，并且也使用相同的名称在班级范围内。因此，这可能会发生，因为变量已在您的代码中自由混合。

您应该尝试在MainMenu类中显式获取连接和光标。下面的内容应确保您每次都获取新连接，并且您的代码不会将变量混合在范围之外。

class MainMenu(BoxLayout):

    def __init__(self):
        super(MainMenu, self).__init__(self)
        self.con = lite.connect('test.db')
        self.cur = con.cursor()

    def display_account(self):
        self.dropdown.dismiss()
        self.remove_widgets()
        self.rvaccount = TEST()
        self.content_area.add_widget(self.rvaccount)
        self.cur.close()
        self.con.close()

    def insert_update_account(self, obj):
        self.cur.execute("UPDATE table SET test1=?, test2=? WHERE test3=?",
                    (obj.col_data[1], obj.col_data[2], obj.col_data[0]))
        self.con.commit()
        self.display_account()

ReferenceError：弱引用的对象不再存在

test.py

1 个答案: