I have been learning more about Tkinter recently and decided to revisit the Caesar Cipher I did back at the beginning of the year to see if I could add a GUI (Graphical User Interface) to it. I find revisiting older project and adding new learnings onto them helps to make sure that a) I understand the new learnings and b) that my original code was commented or understandable enough that several months later it still makes sense.
The full Python code and my original non-GUI version can be found on my GitHub:
https://github.com/geektechdude/Python_Caesar_Cipher
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#!/usr/bin/python3
# Caesar Cipher with GUI
# GeekTechStuff
# modules to import
from tkinter import *
from tkinter import ttk
# variable
letters=”ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ”
# creates Tkinter window
root = Tk()
# creates window title
root.title(‘GeekTechStuff Caesar Cipher’)
# allows for window to be resized
root.resizable(True,True)
# window background
root.configure(background=’blue’)
root.frame_header = ttk.Frame()
ttk.Label(root.frame_header, text = ‘Caesar Cipher’, style = ‘Header.TLabel’).grid(row = 0, column = 1)
ttk.Label(root.frame_header, text = ‘Enter Number (1-25):’, style = ‘Header.TLabel’).grid(row = 1, column = 0)
ttk.Label(root.frame_header, text = ‘Text:’, style = ‘Header.TLabel’).grid(row = 2, column = 0)
ttk.Label(root.frame_header, text=’Encrypted/Decrypted Text:’,style=’Header.TLabel’).grid(row=4, column=0)
# seperated the .grid as it was causing a None type error
enc_dec_text = ttk.Entry(root.frame_header, width=110)
enc_dec_text.grid(row=4,column=1)
# cipher shift drop down
cipher_shift_menu = StringVar()
Spinbox(root.frame_header,from_=1, to=25, textvariable=cipher_shift_menu).grid(row=1, column=1)
# text entry
# seperated the .grid as it was causing a None type error
text_entry = ttk.Entry(root.frame_header, width=100)
text_entry.grid(row=2,column=1)
def encrypt_text():
stringtoencrypt = text_entry.get()
stringtoencrypt = str(stringtoencrypt)
stringtoencrypt=stringtoencrypt.upper()
ciphershift = cipher_shift_menu.get()
ciphershift=int(ciphershift)
stringencrypted=””
for character in stringtoencrypt:
position = letters.find(character)
newposition = position+ciphershift
if character in letters:
stringencrypted = stringencrypted + letters[newposition]
else:
stringencrypted = stringencrypted + character
enc_dec_text.insert(0, stringencrypted)
def decrypt_text():
stringtodecrypt = text_entry.get()
stringtodecrypt = str(stringtodecrypt)
stringtodecrypt=stringtodecrypt.upper()
ciphershift = cipher_shift_menu.get()
ciphershift=int(ciphershift)
stringdecrypted=””
for character in stringtodecrypt:
position = letters.find(character)
newposition = position-ciphershift
if character in letters:
stringdecrypted = stringdecrypted + letters[newposition]
else:
stringdecrypted = stringdecrypted + character
enc_dec_text.insert(0, stringdecrypted)
# buttons to encrypt / decrypt
encrypt_button = ttk.Button(root.frame_header,text=’Encrypt’,command = lambda: encrypt_text()).grid(row=3,column=0)
decrypt_button = ttk.Button(root.frame_header,text=’Decrypt’,command = lambda: decrypt_text()).grid(row=3,column=1)
root.frame_header.pack()
root.mainloop()
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The GUI works but doesn’t look the best; I think with a little editing I can get it to look better.
GeekTechStuff 
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