Tkinter GUI for hangman game - python-2.7

Question

I am trying to code a simple hangman game in python with a gui using tkinter. I have the gui frame set up with a user entry. The problem is when I enter a letter then run the code by pressing the play button it runs the letter through the code until the code runs out of lives (10 times). How can i improve my code so a letter is only run through once then a new letter can be input to guess again?
thank you
from numpy import*
from Tkinter import*
#set up gui frame
win=Tk() #create window assigned to variable win
welc=Label(win,text="Welcome to Hangman!").grid(row=0)
inst=Message(win,text="instructions: To play start by guessing a letter in the secret word. if the letter is in the word it will fill in a blank if not you lose a life. Continue guessing untill you have guessed the secret word.").grid(row=1)
guess_text=Label(win,text="Enter a letter or Word").grid(row=2)
blank_text=Label(win,text="Secret Word").grid(row=3)
lives_text=Label(win,text="Lives Remaining").grid(row=4)
e=Entry(win)
e.grid(row=2,column=1)
#library of secret words
lib=['hanakah','christmas','holly','thanksgiving','reigndeer','family','presents','santa','kwanza', 'chocolate', 'cheesecake']
n=len(lib)
#randomly pick secret word
inx=random.randint(1,n)
secret=lib[inx]
#set up game
lives_remaining=10
guessed_letters=''
#define function to play game
def play():
word=secret
while True:
guess=get_guess(word)
print guess
print type(guess)
if process_guess(guess,word):
Label(win,text="You Win!").grid(row=6)
break
if lives_remaining==0:
Label(win,text="You Lose!").grid(row=6)
Label(win,text="The secret word was: "+word).grid(row=7)
break
Button(win,text=("Play"),command=play).grid(row=5,column=0)
def get_guess(word):
blanks(word)
guess=e.get()
return guess
#diplay guessed letter in postion of word
def blanks(word):
Label(win,text=lives_remaining).grid(row=4,column=1)
display_word=''
for letter in word:
if guessed_letters.find(letter)> -1:
#LETTER found
display_word=display_word+letter
else:
#letter not found
display_word=display_word+'-'
Label(win,text=display_word).grid(row=3,column=1)
def process_guess(guess,word):
if len(guess)>1 and len(guess)==len(word):
return whole_word_guess(guess, word)
else:
return single_letter_guess(guess, word)
def whole_word_guess(guess, word):
if guess.lower() == word.lower():
return True
else:
lives_remaining=lives_remaining+(-1)
return False
def single_letter_guess(guess, word):
global guessed_letters
global lives_remaining
if word.find(guess) == -1:
# letter guess was incorrect
lives_remaining = lives_remaining+(-1)
guessed_letters = guessed_letters + guess.lower()
if all_letters_guessed(word):
return True
return False
def all_letters_guessed(word):
for letter in word:
if guessed_letters.find(letter.lower()) == -1:
return False
return True
mainloop()

Answer 1

I think I understand now.
The get_guess function is always pulling whatever info is in the e Entry, it's not waiting for the value of e to change.
A simple fix without creating listeners would be to create a new global variable called last_guess which can be initialized to '' and then passsed to get_guess as a 2nd arg to check if the guess has changed:
def get_guess(word, last_guess):
blanks(word)
guess=e.get()
#If the guess has not changed ret false
if guess == last_guess:
return False
#If the guess has changed update the last_guess
else:
last_guess = guess
return guess
And then in the main While loop:
while True:
guess=get_guess(word)
print guess
print type(guess)
if not guess: #<-- If the get_guess returned False
continue #<-- Just go on to on to the next iteration of the loop w/out updating lives etc
if process_guess(guess,word):
Label(win,text="You Win!").grid(row=6)
break
if lives_remaining==0:
Label(win,text="You Lose!").grid(row=6)
Label(win,text="The secret word was: "+word).grid(row=7)
break
I haven't run this code so it might have errors, but I think the general idea will work