如何解决KIVY 中 super() 类中的类型错误
我试图创建一个弹出窗口，显示参数中给定的值。 我的代码是：
from kivy.app import App
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.boxlayout import BoxLayout
#Import widgets
from kivy.uix.button import Button
from kivy.uix.textinput import TextInput
from kivy.uix.label import Label
from kivy.uix.popup import Popup
#Importing the clipboard
from kivy.core.clipboard import Clipboard
'''
The popup that shows the encoded or the decoded text,with a copy and paste button
'''
class Ans_pop(Popup):
def __init__(self,text,**kwargs):
self.a = super(Ans_pop,self).__init__(**kwargs)
#The title of the popup
self.a['title'] = 'Result'
#The main layout that is shown on the popup
#Note* Only one layout can be added in popup
self.box = BoxLayout(orientation='vertical')
#The text to be displayed
self.result = text
#The label that displays the text to be displayed
self.res_lab = Label(text = self.result,font_size = 50)
#The boxLayout that displayes the copy and paste button on the boxLayout
self.a3 = BoxLayout(orientation='horizontal')
def reposition_b3(a3,*args):
self.btn_3.pos = self.a3.x,self.a3.y
self.btn_3.size = self.a3.width,self.a3.height/2
#The copy button:
self.btn_3 = Copy_Btn(text,text = 'Copy',size = (self.a3.width/2,self.a3.height),pos=(self.a3.x,self.a3.y))
#The resize of the button
self.a3.bind(on_size=reposition_b3,on_pos=reposition_b3)
#The container of the buttons:
self.a3.add_widget(btn_3)
#The label and the container of labels in the main boxcontainer
self.box.add_widget(self.res_lib)
self.box.add_widget(self.a3)
### ADD THE MAIN BOX CONTAINER IN THE POPUP WINDOW ##
self.a.content = self.box
'''
The copy button feature,that appends the text in the instance to the clipboard
'''
class Copy_Btn(Button):
def __init__(self,instance,**kwargs):
self.a = super(Copy_Btn,self).__init__(**kwargs)
self.instance = instance
def on_release(self):
Clipboard.copy(self.instance)
class APP(App):
def build(self):
a = Ans_pop('This is the text in popup')
a.show()
return a
出于某种原因，我不想展示您的某些代码。请原谅我！ 但是别担心，因为要运行弹出窗口，给定的代码已经足够了！ 当我运行此代码时：
[INFO ] [Logger ] Record log in C:\Users\new\.kivy\logs\kivy_21-01-15_101.txt
[INFO ] [deps ] Successfully imported "kivy_deps.angle" 0.3.0
[INFO ] [deps ] Successfully imported "kivy_deps.glew" 0.3.0
[INFO ] [deps ] Successfully imported "kivy_deps.sdl2" 0.3.1
[INFO ] [Kivy ] v2.0.0
[INFO ] [Kivy ] Installed at "C:\Users\new\AppData\Local\Programs\Python\Python39-32\lib\site-packages\kivy\__init__.py"
[INFO ] [Python ] v3.9.0 (tags/v3.9.0:9cf6752,Oct 5 2020,15:23:07) [MSC v.1927 32 bit (Intel)]
[INFO ] [Python ] Interpreter at "C:\Users\new\AppData\Local\Programs\Python\Python39-32\pythonw.exe"
[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 ] GLEW initialization succeeded
[INFO ] [GL ] Backend used <glew>
[INFO ] [GL ] OpenGL version <b'4.5.13474 Compatibility Profile Context 22.19.162.4'>
[INFO ] [GL ] OpenGL vendor <b'ATI Technologies Inc.'>
[INFO ] [GL ] OpenGL renderer <b'AMD Radeon(TM) R4 Graphics'>
[INFO ] [GL ] OpenGL parsed version: 4,5
[INFO ] [GL ] Shading version <b'4.50'>
[INFO ] [GL ] Texture max size <16384>
[INFO ] [GL ] Texture max units <32>
[INFO ] [Window ] auto add sdl2 input provider
[INFO ] [Window ] virtual keyboard not allowed,single mode,not docked
[INFO ] [Clipboard ] Provider: winctypes
[INFO ] [Base ] Start application main loop
[INFO ] [GL ] NPOT texture support is available
Traceback (most recent call last):
File "F:\Python tries#1\Simple Cryptography (Kivy)\Cryptography App.py",line 197,in <module>
Crypto().run()
File "C:\Users\new\AppData\Local\Programs\Python\Python39-32\lib\site-packages\kivy\app.py",line 950,in run
runTouchApp()
File "C:\Users\new\AppData\Local\Programs\Python\Python39-32\lib\site-packages\kivy\base.py",line 582,in runTouchApp
EventLoop.mainloop()
File "C:\Users\new\AppData\Local\Programs\Python\Python39-32\lib\site-packages\kivy\base.py",line 347,in mainloop
self.idle()
File "C:\Users\new\AppData\Local\Programs\Python\Python39-32\lib\site-packages\kivy\base.py",line 391,in idle
self.dispatch_input()
File "C:\Users\new\AppData\Local\Programs\Python\Python39-32\lib\site-packages\kivy\base.py",line 342,in dispatch_input
post_dispatch_input(*pop(0))
File "C:\Users\new\AppData\Local\Programs\Python\Python39-32\lib\site-packages\kivy\base.py",line 308,in post_dispatch_input
wid.dispatch('on_touch_up',me)
File "kivy\_event.pyx",line 709,in kivy._event.EventDispatcher.dispatch
File "C:\Users\new\AppData\Local\Programs\Python\Python39-32\lib\site-packages\kivy\uix\behaviors\button.py",line 179,in on_touch_up
self.dispatch('on_release')
File "kivy\_event.pyx",in kivy._event.EventDispatcher.dispatch
File "F:\Python tries#1\Simple Cryptography (Kivy)\Cryptography App.py",line 95,in on_release
Ans_pop(encoded_text)
File "F:\Python tries#1\Simple Cryptography (Kivy)\Cryptography App.py",line 38,in __init__
self.a['title'] = 'Result'
TypeError: 'NoneType' object does not support item assignment
在此突出显示错误是：
File "F:\Python tries#1\Simple Cryptography (Kivy)\Cryptography App.py",in __init__
self.a['title'] = 'Result'
TypeError: 'NoneType' object does not support item assignment
如何修复错误？
解决方法
代码：
class Ans_pop(Popup):
def __init__(self,text,**kwargs):
self.a = super(Ans_pop,self).__init__(**kwargs)
#The title of the popup
self.a['title'] = 'Result'
应改为：
class Ans_pop(Popup):
def __init__(self,**kwargs):
super(Ans_pop,self).__init__(**kwargs)
#The title of the popup
self.title = 'Result'
__init__() 方法返回 None，导致您的错误。而 title 只是 Popup 的一个属性。由于您的 Ans_pop 扩展了 Popup，因此 title 只是 Ans_pop 的一个属性。
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