Question

我有一些代码要求用户输入他们要加密的单词，然后程序会加密单词并将其显示在标签上。我想知道为什么以下代码有效：

import tkinter

letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

encryption_code = 'LFWOAYUISVKMNXPBDCRJTQEGHZ'
letters += letters.lower()
encryption_code += encryption_code.lower()

window = tkinter.Tk()
encryption_code_entry = tkinter.Entry(window)
entry = tkinter.Entry(window)

enc = dict(zip(letters,encryption_code))

string = 'hello world'

encr = "".join([enc.get(ch, ch) for ch in string])

def encrypt():    
    encrypt_label.pack()
    entry.pack()
    encrypt_confirm.pack()
    encrypt_button.destroy()

def display_encrypt():
    display_enc = encr
    encrypted_label.pack()
    new_message.config(text=str(display_enc))
    new_message.pack()

encrypt_confirm = tkinter.Button(window, text="Confirm", command=display_encrypt)
new_message = tkinter.Label(window, text="", font=('Helvetica', 10))
encrypted_label = tkinter.Label(window, text="Your message " + entry.get() + " has been encrypted into the following: ")
encrypt_button = tkinter.Button(window, text="Encrypt", command=encrypt)
encrypt_button.pack()
encrypt_label = tkinter.Label(window, text="Please enter the message you'd like to encrypt", font=('Helvetica', 14))

window.mainloop()

但如果我将string = 'hello world'（这是我想要做的）更改为string = entry.get()，则不会显示任何内容on new_message`。另外，

encrypted_label = tkinter.Label(window, text="Your message " + entry.get() + "has been encrypted into the following: ")

不会显示用户在输入框中输入的内容，因此我几乎100％确定我误用了entry.get()功能。

Answer 1

您实际上需要在entry.get()下设置display_encrypt()。

每按一次encrypt_confirm按钮，它就会调用display_encrypt，然后每次用户按下时，entry都可以获取当前字符串。

我编辑了你的代码，似乎工作正常。

请注意，我已删除string和encr，因为它们现在是冗余变量。

import tkinter

letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

encryption_code = 'LFWOAYUISVKMNXPBDCRJTQEGHZ'
letters += letters.lower()
encryption_code += encryption_code.lower()

window = tkinter.Tk()
encryption_code_entry = tkinter.Entry(window)
entry = tkinter.Entry(window)

enc = dict(zip(letters,encryption_code))

string = 'hello world'

def encrypt():    
    encrypt_label.pack()
    entry.pack()
    encrypt_confirm.pack()
    encrypt_button.destroy()

def display_encrypt():
    display_enc = "".join([enc.get(ch, ch) for ch in entry.get()])
    encrypted_label.pack()
    new_message.config(text=str(display_enc))
    new_message.pack()

encrypt_confirm = tkinter.Button(window, text="Confirm", command=display_encrypt)
new_message = tkinter.Label(window, text="", font=('Helvetica', 10))
encrypted_label = tkinter.Label(window, text="Your message " + entry.get() + " has been encrypted into the following: ")
encrypt_button = tkinter.Button(window, text="Encrypt", command=encrypt)
encrypt_button.pack()
encrypt_label = tkinter.Label(window, text="Please enter the message you'd like to encrypt", font=('Helvetica', 14))

window.mainloop()

Answer 2

在用户有机会输入任何内容之前，您正在呼叫entry.get()。您需要调用它并重置标签以响应事件，例如用户按下＆lt; Return＆gt;，单击按钮等。

entry.get（）函数不会改变变量的值

2 个答案: