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customtk.py
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import customtkinter as ctk
from tkinter import messagebox
def main():
def show_error_message(message):
messagebox.showerror("Error", message)
def printen():
try:
key = int(keyentry.get())
except:
show_error_message("The key must be an integer")
return
entext = encrypt(textentry.get(), key)
outtext.delete(1.0, ctk.END)
outtext.insert(ctk.END, entext)
def printde():
try:
key = int(keyentry.get())
except:
show_error_message("The key must be integer")
return
entext = decrypt(textentry.get(), key)
outtext.delete(1.0, ctk.END)
outtext.insert(ctk.END, entext)
def clear():
outtext.delete("1.0", ctk.END)
textentry.delete(0, ctk.END)
keyentry.delete(0, ctk.END)
app = ctk.CTk()
ctk.set_appearance_mode("System")
ctk.set_default_color_theme("dark-blue")
app.geometry("600x500")
app.title("Caeser cipher")
#lable
label = ctk.CTkLabel(master=app, text="Hello world\n This is caeser cipher encrypter and decrypter", font=("Verdana", 18))
label.place(relx=0.5, y=40, anchor="center")
#text lable
textlabel = ctk.CTkLabel(master=app, text="Text", font=("Verdana",17))
textlabel.place(y=100, x=50)
#text entry
textentry = ctk.CTkEntry(master=app, width=400, height=30, placeholder_text="Alphabetical letters only", placeholder_text_color="gray", font=("Verdana",17), border_color="black")
textentry.place(y=100, x=100)
#key label
keylabel = ctk.CTkLabel(master=app, text="Key", font=("Verdana",17))
keylabel.place(y=150, x=50)
#key entry
keyentry = ctk.CTkEntry(master=app, height=30, width=150, placeholder_text="Integer only", placeholder_text_color="gray", font=("Verdana",17), border_color="black")
keyentry.place(y=150, x=100)
#encryption button
enbutton = ctk.CTkButton(master=app, text="Encrypt", width=100, corner_radius=12, fg_color="transparent", border_color="black", border_width=2, hover_color="black", font=("Verdana", 16), command=printen)
enbutton.place(y=220, x=100)
#decryption button
debutton = ctk.CTkButton(master=app, text="Decrypt", width=100, corner_radius=12, fg_color="transparent", border_color="black", border_width=2, hover_color="black", font=("Verdana", 16), command=printde)
debutton.place(y=220, x=240)
#clear button
clearbutton = ctk.CTkButton(master=app, text="Clear all", width=100, corner_radius=12, fg_color="transparent", border_color="black", border_width=2, hover_color="black", font=("Verdana", 16), command=clear)
clearbutton.place(y=220, x=380)
#ouput label
outlabel = ctk.CTkLabel(master=app, text="Your message", font=("Verdana", 17), corner_radius=12, fg_color="transparent")
outlabel.place(y=335, x=50)
#output text
outtext = ctk.CTkTextbox(master=app, width=300, height=100, corner_radius=12, border_width=2, border_color="black", fg_color="transparent", font=("Verdana",17))
outtext.place(y=300, x=200)
app.mainloop()
def show_error_message(message):
messagebox.showerror("Error", message)
def encrypt(text, n):
if any(not letter.isalpha() and not letter.isspace() for letter in text):
show_error_message("Can only decrypt and encrypt alphabetical letters")
return
entext = ''
for letter in text:
if letter.isspace():
entext += letter
if letter.isupper():
dvalue = ord(letter)
if n > 26:
n -= 26
dvalue += n
if dvalue > ord("Z"):
dvalue -= 26
entext += chr(dvalue)
elif letter.islower():
dvalue = ord(letter)
if n > 26:
n -= 26
dvalue += n
if dvalue > ord("z"):
dvalue -= 26
entext += chr(dvalue)
return entext
def decrypt(text, n):
if any(not letter.isalpha() and not letter.isspace() for letter in text):
show_error_message("Can only decrypt and encrypt alphabetical letters")
return
entext = ''
for letter in text:
if letter.isspace():
entext += letter
if letter.isupper():
dvalue = ord(letter)
if n > 26:
n -= 26
dvalue -= n
if dvalue < ord("A"):
dvalue += 26
entext += chr(dvalue)
elif letter.islower():
dvalue = ord(letter)
if n > 26:
n -= 26
dvalue -= n
if dvalue < ord("a"):
dvalue += 26
entext += chr(dvalue)
return entext
if __name__=="__main__":
main()