Question

在为小型加密程序开发tkinter接口的过程中，我将它从.pack（）切换，我只在开始写出按钮时使用它，例如.grid（）。以前我设置了一个Entry小部件，两个按钮和两个链接到它们的功能。他们所做的就是将Entry小部件中的任何内容打印到控制台。

我将代码更改为：##请忽略注释掉的内容

import time
from tkinter import *

def doNothing(): ##To when a menu item is clicked
    print("Program did nothing")
root = Tk()



menu = Menu(root)
root.config(menu=menu)

##subMenu = Menu(menu)
##menu.add_cascade(label="File", menu=subMenu)
##subMenu.add_command(label="New project", command=doNothing)
##subMenu.add_command(label="New", command =doNothing)
####subMenu.add_seperator()
##subMenu.add_command(label="Exit", command=doNothing)
##
##editMenu = Menu(menu)
##menu.add_cascade(label="Edit", menu=editMenu)
##editMenu.add_command(label="Redo", command=doNothing)
##
####Toolbar
##toolbar = Frame(root, bg="blue")
##insertButton = Button(toolbar, text="Insert image", command = doNothing)
##insertButton.pack(side=LEFT, padx=5, pady=5) ##Five pixels of space to pad the button
##printButton = Button(toolbar, text="Print", command = doNothing)
##printButton.pack(side=LEFT, padx=5, pady=5)
##
##toolbar.pack(side=TOP, fill=X) ##However wide the window is toolbar will take up the x axis
##
####Statusbar
##status = Label(root, text="Prepearing to do nothing", bd=1, relief=SUNKEN, anchor=W) ##bd => border
##status.pack(side=BOTTOM, fill=X)
##
##Text box
Input_Box = Entry(root, bg="grey").grid(row=0, column=0)
##Input_Box.pack(anchor=CENTER)
def Encrypt_Button_Press():
    User_Input = Input_Box.get()
    print(User_Input)
def Decrypt_Button_Press():
    User_Input = Input_Box.get()
    print(User_Input)

Encrypt_Button = Button(text="Encrypt", command=Encrypt_Button_Press).grid(row=1)
##Encrypt_Button.pack(anchor=CENTER, side=LEFT)

Decrypt_Button = Button(text="Decrypt", command=Decrypt_Button_Press).grid(row=2)
##Decrypt_Button.pack(anchor=CENTER, side=LEFT)
root.mainloop()

我收到错误 -

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python34\lib\tkinter\__init__.py", line 1487, in __call__
    return self.func(*args)
  File "C:\Users\Theo_2\Google Drive\Computer science\Encryption and decryption work\Cipher 2\Tkinter 10 toolbar and statusbar.py", line 41, in Encrypt_Button_Press
    User_Input = Input_Box.get()
AttributeError: 'NoneType' object has no attribute 'get'
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python34\lib\tkinter\__init__.py", line 1487, in __call__
    return self.func(*args)
  File "C:\Users\Theo_2\Google Drive\Computer science\Encryption and decryption work\Cipher 2\Tkinter 10 toolbar and statusbar.py", line 41, in Encrypt_Button_Press
    User_Input = Input_Box.get()
AttributeError: 'NoneType' object has no attribute 'get'

当您尝试引用（在这种情况下获取）某些内容时，会出现此错误。但是我不明白为什么一旦我运行.py文件就会出现。我甚至不必点击两个按钮中的任何一个。

感谢帮助

Answer 1

在tkinter中，Widget.pack和Widget.grid都返回None。因此，Input_Box的值为None。您希望在不同的行上创建和网格化小部件。

Input_Box = Entry(root, bg="grey")
Input_Box.grid(row=0, column=0)

Python-从pack（）更改为.grid（）会导致AttributeError：＆＃39; NoneType＆＃39;对象没有属性＆＃39; get＆＃39;

1 个答案: