如何在tkinter窗口上添加函数结果字符串？

Question

I am new in python and trying to make a program for converting a given string into a secret code. The string entered by user in the text box is taken as input and converted in secret code (using the encryption module). How do I display the result in the window (I tried using the label but it shows an error.)

from tkinter import *
import encryption as En             # Loading Custom libraries
import decryption as De
out_text = None     # Out text is the output text of message or the encryption
root = None
font_L1 = ('Verdana', 18, 'bold')   # The font of the header label
button1_font = ("Ms sans serif", 8, 'bold')
button2_font = ("Ms sans serif", 8, 'bold')
font_inst = ("Aerial", 8)
my_text = None
input_text = None
text_box = None
resut_l = None
result_2 = None

def b1_action():                       # Encryption button
    input_text = text_box.get()
    if input_text == "":
        print("Text field empty")
    else:
        En.enc_text(input_text)         # Message is returned as 'code'

def b2_action():
    input_text = text_box.get()
    if input_text == "":
        print("Text field Empty")
    else:
        De.dec_text(input_text)        

def enc_button():           # Button for rendering encryption
    b1 = Button(root, text = "ENCRYPT", font = button1_font, command = b1_action)
    b1.configure(bg = 'palegreen3', width = '10', height = '3')
    b1.place(x = '120', y = '130')

def dec_button():           # Button for decryption
    b2 = Button(root, text = "DECRYPT", font = button2_font, command = b2_action)
    b2.configure(bg = 'palegreen3', width = '10', height = '3')
    b2.place(x = '340', y = '130')

def main():                         #This is the core of GUI
    global root
    global text_box
    root = Tk()
    root.geometry("550x350")
    root.configure(bg = "MediumPurple1")
    win_text = Label(root, text = 'Enter text below and Choose an action:', bg = 'MediumPurple1', font = font_L1)
    win_text.place(x = '10', y = '50')
    text_box = Entry(root, text = 'Enter the Text', width = 60, bg = 'light blue')
    text_box.place(x = '100', y = '100')
    inst_text = Label(root, text = instructions, bg = "MediumPurple1", font = font_inst)
    inst_text.pack(side = BOTTOM)
    enc_button()
    dec_button()
    root.title('Secret Message.')
    root.mainloop() 


main()

And here is the encryption module

def enc_text(line):
    msg = str(line).replace(' ', '_').lower()
    msg_list = list(msg)
    all_char = list("abcdefghijklmnopqrstuvwxyzabc_!?@")

    for i in range(0, len(msg)):
        pos_replaced = all_char.index(str(msg_list[i])) #will give the positon of the word to be replaced in the main list of alphabets
        msg_list.insert(i, all_char[pos_replaced + 3])  #will replace the elements one by one
        msg_list.pop(i + 1)
        i += 1

    code = ''.join(msg_list).replace('@', ' ')
    print(code)

You can also suggest some improvisations.

Answer 1

Part of the problem is that Entry widgets don't have a text= configuration option, so it's completely ignored in the line:

text_box = Entry(root, text='Enter the Text', width=60, bg='light blue')

The best way to handle the character contents of an Entry is by using its textvariable= option and setting the value of it to be an instance of a tkinter.StringVar , then the getting and setting the value of that object will automatically update the Entry widget on the screen.

Below is your code with changes made to it to do this. Note I commented and changed a few unrelated things to be able to run the code, but tried to indicate the most important ones. Also note I added a return code statement at the very end of the enc_text() function in your custom encryption module.

from tkinter import *
import encryption as En             # Loading Custom libraries
#import decryption as De            # DON'T HAVE THIS.

out_text = None     # Out text is the output text of message or the encryption
root = None
font_L1 = ('Verdana', 18, 'bold')   # The font of the header label
button1_font = ("Ms sans serif", 8, 'bold')
button2_font = ("Ms sans serif", 8, 'bold')
font_inst = ("Aerial", 8)
my_text = None
input_text = None
text_var = None                     # ADDED.
text_box = None
resut_l = None
result_2 = None

# CHANGED TO USE NEW "text_var" variable.
def b1_action():                       # Encryption button
    input_text = text_var.get()
    if input_text == "":
        print("Text field empty")
    else:
        text_var.set(En.enc_text(input_text))

def b2_action():
    input_text = text_box.get()
    if input_text == "":
        print("Text field Empty")
    else:
        """De.dec_text(input_text)"""

def enc_button():           # Button for rendering encryption
    b1 = Button(root, text="ENCRYPT", font=button1_font, command=b1_action)
    b1.configure(bg='palegreen3', width='10', height='3')
    b1.place(x='120', y='130')

def dec_button():           # Button for decryption
    b2 = Button(root, text="DECRYPT", font=button2_font, command=b2_action)
    b2.configure(bg='palegreen3', width='10', height='3')
    b2.place(x='340', y='130')

def main():                         #This is the core of GUI
    global root
    global text_box
    global text_var                 # ADDED
    root = Tk()
    root.geometry("550x350")
    root.configure(bg="MediumPurple1")
    win_text = Label(root, text='Enter text below and Choose an action:',
                     bg='MediumPurple1', font=font_L1)
    win_text.place(x='10', y='50')
    text_var = StringVar()          # ADDED
    text_var.set('Enter the Text')  # ADDED
    # CHANGED text='Enter the Text' to textvariable=text_var
    text_box = Entry(root, textvariable=text_var, width=60, bg='light blue')
    text_box.place(x='100', y='100')
    inst_text = Label(root, text="instructions", bg="MediumPurple1",
                      font=font_inst)
    inst_text.pack(side=BOTTOM)
    enc_button()
    dec_button()
    root.title('Secret Message.')
    root.mainloop()

main()