问TypeError: object.init()在将Kivy应用程序迁移到2.0.0时只接受一个参数
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Stack Overflow用户

提问于 2021-02-04 10:49:13

回答 1查看 56关注 0票数 0

有没有人能给点建议？

我有一个应用程序在Pi3/ArchLinuxArm/Kivy1.11上运行得很好。

我正在尝试将应用程序移动到Pi4/RasPiOS Lite (Buster)/Kivy2.0.0。现在，我动态生成按钮的一段代码失败了，错误代码是：

 Traceback (most recent call last):
   File "Main.py", line 57, in <module>
     main()
   File "Main.py", line 34, in main
     Display.Display()
   File "/home/automate/Display.py", line 657, in Display
     DisplayApp().run()
   File "/home/automate/.local/lib/python3.7/site-packages/kivy/app.py", line 949, in run
     self._run_prepare()
   File "/home/automate/.local/lib/python3.7/site-packages/kivy/app.py", line 919, in _run_prepare
     root = self.build()
   File "/home/automate/Display.py", line 649, in build
     sm.add_widget(ControlLightsScreen(name='c_lights'))
   File "/home/automate/Display.py", line 315, in __init__
     on_press = self.on_event
   File "/home/automate/.local/lib/python3.7/site-packages/kivy/uix/behaviors/button.py", line 121, in __init__
     super(ButtonBehavior, self).__init__(**kwargs)
   File "/home/automate/.local/lib/python3.7/site-packages/kivy/uix/label.py", line 318, in __init__
     super(Label, self).__init__(**kwargs)
   File "/home/automate/.local/lib/python3.7/site-packages/kivy/uix/widget.py", line 350, in __init__
     super(Widget, self).__init__(**kwargs)
   File "kivy/_event.pyx", line 245, in kivy._event.EventDispatcher.__init__
 TypeError: object.__init__() takes exactly one argument (the instance to initialize)

有问题的代码段是：

    for j in range(len(Lights.lights)):
        i = j
        button = Button(
                        text = Lights.lights[i][2], font_size = 24,
                        text_size = (160,60),
                        halign = 'center', valign = 'center',
                        size_hint_x = None, width = 188,
                        size_hint_y = None, height = 68,
                        id=str(i),
                        color = black,
                        background_normal = '',
                        background_color = grey,
                        on_press = self.on_event
                       )
        self.mylights.append([grey,button])
        grid.add_widget(button)

我尝试删除报告错误的行("on_press = self.on_event")，所有这些操作都是将报告的错误移到上面的行。注释掉整段代码后，应用程序就可以正常运行了。

类似的代码，动态生成标签仍然是完全有效的。

我做错了什么吗?还是在1.11.1和2.0.0之间有一些我需要考虑的变化？

启动诊断程序包括：

[INFO   ] [Logger      ] Record log in /home/automate/.kivy/logs/kivy_21-02-04_10.txt
[INFO   ] [Kivy        ] v2.0.0
[INFO   ] [Kivy        ] Installed at "/home/automate/.local/lib/python3.7/site-packages/kivy/__init__.py"
[INFO   ] [Python      ] v3.7.3 (default, Jul 25 2020, 13:03:44) 
[GCC 8.3.0]
[INFO   ] [Python      ] Interpreter at "/usr/bin/python"
[INFO   ] [Factory     ] 186 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: sdl2
[INFO   ] [Window      ] Provider: sdl2
[INFO   ] [GL          ] Using the "OpenGL" graphics system
[INFO   ] [GL          ] Backend used <sdl2>
[INFO   ] [GL          ] OpenGL version <b'OpenGL ES 3.1 Mesa 19.3.2'>
[INFO   ] [GL          ] OpenGL vendor <b'VMware, Inc.'>
[INFO   ] [GL          ] OpenGL renderer <b'llvmpipe (LLVM 9.0.1, 128 bits)'>
[INFO   ] [GL          ] OpenGL parsed version: 3, 1
[INFO   ] [GL          ] Shading version <b'OpenGL ES GLSL ES 3.10'>
[INFO   ] [GL          ] Texture max size <8192>
[INFO   ] [GL          ] Texture max units <32>
[INFO   ] [Window      ] auto add sdl2 input provider
[INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked

python

kivy

raspbian

raspberry-pi4

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回答 1

Stack Overflow用户

发布于 2021-02-05 16:08:49

我被可靠地告知'id‘不是一个按钮属性，尽管在v2.0.0之前它的行为是这样的

当然，解决方案很简单。从按钮的已分配属性列表中删除id，但在按钮代码button.id = i调用的正下方添加新行。然后可以在on_event代码中引用obj.id：

    for j in range(len(Lights.lights)):
        i = j
        button = Button(
                        text = Lights.lights[i][2], font_size = 24,
                        text_size = (160,60),
                        halign = 'center', valign = 'center',
                        size_hint_x = None, width = 188,
                        size_hint_y = None, height = 68,
                        color = black,
                        background_normal = '',
                        background_color = grey,
                        on_press = self.on_event
                       )
        button.id = i
        self.mylights.append([grey,button])
        grid.add_widget(button)


def on_event(self, obj):
    myid = obj.id