如何将函数返回到标签中？

时间：2017-03-07 22:31:32

标签： python python-2.7 tkinter

首先是一个小小的免责声明： 我对一般的编程很陌生，我有很多东西需要学习。所以我的代码可能看起来很草率和荒谬。所以我很抱歉。

我正在尝试创建一个简单的gui程序，它接受用户输入的文本并将其从我制作的字典中变成乱码。因此，您可以加密和解密文本。这是我制作的控制台脚本：

 `list = {"a": "l", "b": "k", "c": "j", "d": "h", "e": "g", "f": "d", "g": "f", "h": "d", "i": "s", "j": "a", "k": "q", "l": "w", "m": "e", "n": "r", "o": "t", "p": "y", "q": "u", "r": "z", "s": "x", "t": "c", "u": "m", "v": "n", "w": "p", "x": "b", "y": "i", "z": "o", " ": " "} 
list_2 = {"l": "a", "k": "b", "j": "c", "h": "d", "g": "e", "d": "f", "f": "g", "d": "h", "s": "i", "a": "j", "q": "k", "w": "l", "e": "m", "r": "n", "t": "o", "y": "p", "u": "q", "z": "r", "x": "s", "c": "t", "m": "u", "n": "v", "p": "w", "b": "x", "i": "y", "o": "z", " ": " "}


def encrypt():
    user_input = raw_input("what is the messge?:\n")

    for char in user_input:
        print list[char.lower()],


def decrypt():
    user_input = raw_input("what is the messge?:\n")

    for char in user_input:
        print list_2[char.lower()],


which_one = raw_input("type 1 for encrypt, type 2 for decrypt:\n")


if which_one == "1":
    encrypt()
elif which_one == "2":
    decrypt()
else:
    print "ERROR!"
`

所以现在我尝试使用tkinter实现相同的想法但使用gui。我被困在哪里试图基本上打印结果在某处。这就是我到目前为止所做的：

    from Tkinter import *

list = {"a": "l", "b": "k", "c": "j", "d": "h", "e": "g", "f": "d", "g": "f", "h": "d", "i": "s", "j": "a", "k": "q", "l": "w", "m": "e", "n": "r", "o": "t", "p": "y", "q": "u", "r": "z", "s": "x", "t": "c", "u": "m", "v": "n", "w": "p", "x": "b", "y": "i", "z": "o", " ": " "} 
list_2 = {"l": "a", "k": "b", "j": "c", "h": "d", "g": "e", "d": "f", "f": "g", "d": "h", "s": "i", "a": "j", "q": "k", "w": "l", "e": "m", "r": "n", "t": "o", "y": "p", "u": "q", "z": "r", "x": "s", "c": "t", "m": "u", "n": "v", "p": "w", "b": "x", "i": "y", "o": "z", " ": " "}

root = Tk()
encrypt_entry_var = StringVar()
decrypt_entry_var = StringVar()


def encrypt(encrypt_entry_var):
    for char in encrypt_entry_var:
        return list

results = encrypt(encrypt_entry_var)
results_label = Label(root, str(results))



encrypt_entry = Entry(root, textvariable=encrypt_entry_var)
encrypt_button = Button(root, text="Encrypt", command=encrypt)
decrypt_entry = Entry(root, textvariable=decrypt_entry_var)
decrypt_button = Button(root, text="Decrypt")

encrypt_entry.pack(fill=X)
encrypt_button.pack(fill=X)
decrypt_entry.pack(fill=X)
decrypt_button.pack(fill=X)

root.title("Encryption Chat")
root.geometry("500x90")




mainloop()

这是我得到的错误：

Current directory: C:\Users\Cody Pickett\Desktop\Coding\current projects
C:\Python27\python.exe -u "C:\Users\Cody Pickett\Desktop\Coding\current projects\Encrypyion_chat_wgui.py
Process started >>>
Traceback (most recent call last):
  File "C:\Users\Cody Pickett\Desktop\Coding\current projects\Encrypyion_chat_wgui.py", line 15, in <module>
    results = encrypt(encrypt_entry_var)
  File "C:\Users\Cody Pickett\Desktop\Coding\current projects\Encrypyion_chat_wgui.py", line 12, in encrypt
    for char in encrypt_entry_var:
TypeError: iteration over non-sequence
<<< Process finished. (Exit code 1)
================ READY ================

任何帮助都将非常感激。我希望我提供足够的信息来帮助您理解。谢谢大家的时间，祝大家愉快！

更新： 所以现在这是我得到的错误：

Process started >>>
Traceback (most recent call last):
  File "C:\Users\Cody Pickett\Desktop\Coding\current projects\Encrypyion_chat_wgui.py", line 21, in <module>
    encrypt_button = Button(root, text="Encrypt", command=encrypt(encrypt_entry_var))
  File "C:\Users\Cody Pickett\Desktop\Coding\current projects\Encrypyion_chat_wgui.py", line 12, in encrypt
    for char in encrypt_entry_var:
TypeError: iteration over non-sequence
<<< Process finished. (Exit code 1)
================ READY ================

我不明白非序列的迭代究竟意味着什么。我无法绕过谷歌不得不说的话。我以前的项目中从来没有遇到过这个错误。

更新的代码：

from Tkinter import *

list = {"a": "l", "b": "k", "c": "j", "d": "h", "e": "g", "f": "d", "g": "f", "h": "d", "i": "s", "j": "a", "k": "q", "l": "w", "m": "e", "n": "r", "o": "t", "p": "y", "q": "u", "r": "z", "s": "x", "t": "c", "u": "m", "v": "n", "w": "p", "x": "b", "y": "i", "z": "o", " ": " "} 
list_2 = {"l": "a", "k": "b", "j": "c", "h": "d", "g": "e", "d": "f", "f": "g", "d": "h", "s": "i", "a": "j", "q": "k", "w": "l", "e": "m", "r": "n", "t": "o", "y": "p", "u": "q", "z": "r", "x": "s", "c": "t", "m": "u", "n": "v", "p": "w", "b": "x", "i": "y", "o": "z", " ": " "}

root = Tk()
encrypt_entry_var = StringVar()
decrypt_entry_var = StringVar()


def encrypt(encrypt_entry_var):
    for char in encrypt_entry_var:
        return list

results = encrypt(encrypt_entry_var.get())
results_label = Label(root, text=str(results))



encrypt_entry = Entry(root, textvariable=encrypt_entry_var)
encrypt_button = Button(root, text="Encrypt", command=encrypt(encrypt_entry_var))
decrypt_entry = Entry(root, textvariable=decrypt_entry_var)
decrypt_button = Button(root, text="Decrypt")

encrypt_entry.pack(fill=X)
encrypt_button.pack(fill=X)
decrypt_entry.pack(fill=X)
decrypt_button.pack(fill=X)
results_label.pack

root.title("Encryption Chat")
root.geometry("500x90")




mainloop()

1 个答案:

答案 0 :(得分：2)

您传递给函数的参数类型为StringVar，而不是string，它是python string类型的包装。

来自docs -

  

如果您使用Tcl语言编程Tk，您可以要求系统   让你知道变量的变化。 Tk工具包可以使用它   功能，称为跟踪，以在关联时更新某些小部件   变量被修改。

     

没有办法跟踪Python变量的变化，但是Tkinter   允许您创建可在Tk的任何地方使用的变量包装器   可以使用跟踪的Tcl变量。

您只需更改此行

即可 
results = encrypt(encrypt_entry_var)

到

results = encrypt(encrypt_entry_var.get())

固定代码 - 

from Tkinter import *

# changed variable name
list_1 = {"a": "l", "b": "k", "c": "j", "d": "h", "e": "g", "f": "d", "g": "f", "h": "d", "i": "s", "j": "a", "k": "q", "l": "w", "m": "e", "n": "r", "o": "t", "p": "y", "q": "u", "r": "z", "s": "x", "t": "c", "u": "m", "v": "n", "w": "p", "x": "b", "y": "i", "z": "o", " ": " "} 
list_2 = {"l": "a", "k": "b", "j": "c", "h": "d", "g": "e", "d": "f", "f": "g", "d": "h", "s": "i", "a": "j", "q": "k", "w": "l", "e": "m", "r": "n", "t": "o", "y": "p", "u": "q", "z": "r", "x": "s", "c": "t", "m": "u", "n": "v", "p": "w", "b": "x", "i": "y", "o": "z", " ": " "}

root = Tk()
encrypt_entry_var = StringVar()
decrypt_entry_var = StringVar()


def encrypt(encrypt_entry_var):
    # fixed encrypt function 
    return ''.join([list_1[char.lower()] for char in encrypt_entry_var])

results = encrypt(encrypt_entry_var.get())
results_label = Label(root, text=str(results))



encrypt_entry = Entry(root, textvariable=encrypt_entry_var)
# pass a lambda function calling your encrypt function
encrypt_button = Button(root, text="Encrypt", command=lambda : encrypt(encrypt_entry_var))
decrypt_entry = Entry(root, textvariable=decrypt_entry_var)
decrypt_button = Button(root, text="Decrypt")

encrypt_entry.pack(fill=X)
encrypt_button.pack(fill=X)
decrypt_entry.pack(fill=X)
decrypt_button.pack(fill=X)
results_label.pack

root.title("Encryption Chat")
root.geometry("500x90")

mainloop()
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