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I'm having some issues programming a hangman game using tkinter, with the front-end and back-end separated AND both using OOP (i understand using OOP in the backend wasn't really necessary and it probably would've been better as a library but I'm doing this as a learning exercise) . I'm new to tkinter and i was wondering how i can assign the result of the entry textbox to a variable to then pass into a function in the backend. I was also wondering if my self.letter_row and self.guesses_left labels would then be updated as they are updated in the backend, and though i have assigned them to the front at the initiation of game_gui(), i'm not sure if they'll do this automatically. Here's all the frontend code...

from tkinter import *
from tkinter.ttk import *
import hangmanSkeleton as hm

class game_gui():

 def __init__(self,master):
 self.master = master
 master.title("Hangman")

 this_game = hm.Hangman()

 self.word = this_game.word
 self.letter_row = this_game.letter_row
 self.letters_guessed = this_game.letters_guessed
 self.guesses_left = this_game.guesses_left
 self.letter = StringVar()

 self.lbl_word = Label(master, text = "Welcome to Hangman!")
 self.lbl_word.grid(row = 0,padx = 10 , pady = 15, columnspan = 2)

 self.lbl_row = Label(master, text = self.letter_row)
 self.lbl_row.grid(row = 1, column = 0, padx = 15, pady = 10)

 self.lbl_guesses = Label(master, text = "Guesses Left: " + str(self.guesses_left))
 self.lbl_guesses.grid(row = 1, column = 1, padx = 15, pady = 10)

 self.entry_letter= Entry(master, textvariable = self.letter)
 self.entry_letter.grid(row = 2, padx = 10, pady = 20, columnspan = 2)

 self.guess_button = Button(master, text = "Guess Letter", command=lambda: this_game.guess_letter(self.letter))
 self.guess_button.grid(row = 3, padx = 10, pady = 10, columnspan = 2) 


root = Tk()
gui = game_gui(root)
root.mainloop()

And here's just the function from the backend that I'm trying to get to work in self.guess_button() above..

def guess_letter(self, letter): 
 try: 
 if type(letter) != str or len(letter) != 1 or letter not in ascii_lowercase:
 raise TypeError
 if letter in self.letters_guessed:
 raise ValueError
 elif letter in self.word:
 for count in range (len(self.word)):
 if letter==self.word[count]:
 self.letter_row = self.letter_row[0:count] + letter + self.letter_row[count+1:]
 else:
 pass
 self.guesses_left = self.guesses_left-1 #take one away from guesses
 except TypeError:
 print("Value given is not a letter")
 except ValueError:
 print("Letter has already been guessed")

thank you!

Comment: I still can't get my labels self.letter_row and self.guesses_left to update though

Yes, these variables are not bound to the Label, i recommend using Label.configure(text=... instead.
Note: I show only .this_game.letter_row!

Add a function update_labels(... and .configure(... the Labels text:

def update_labels(self):
 self.lbl_row.configure(text=self.this_game.letter_row)
 # and so on

Call this function at last in .__init__(... and .guess_letter(....

The variable self.letter_row is not needed at all.

Question: how i can assign the result of the entry textbox to a variable to then pass into a function in the backend.

Change the following:

• 
  

  Make your variable this_game a member of class game_gui

  
  
  

  self.this_game = hm.Hangman()
  

  
  


• 
  

  Add a helper method guess_letter(... to class game_gui.
  
  Pass the letter to .this_game.guess_letter(....
  
  Clear the letter from .letter.

  
  
  

  def guess_letter(self, letter):
   self.this_game.guess_letter(letter.get())
   letter.set('')
  

  
  


• 
  

  Change the command, pointing to the helper method:

  
  
  

  ..., command=lambda: self.guess_letter(self.letter)