[Python] my code throws out an error i do not understand

So, I've been working on a python version of the game wheel of fortune, here's the code so far

from random import choice
def spin_the_wheel():
wheel = ["BANKRUPT", 650, "FREE PLAY", 700, "LOSE A TURN", 800, 500, 650, 500, 900, "BANKRUPT", 2500, 500, 900, 700, 600, 800, 500, 700, 500, 600, 550, 500, 900]
return choice(wheel)
def make_text_blank(text):
l = list(text)
for i in range(len(text)):
if text.isalpha():
l = "_"
return "".join(l)
def wheel_of_fortune():
print("The category for this puzzle is game show")
text = "WHEEL OF FORTUNE"
blank_text = make_text_blank(text)
print(blank_text)
print("Player 1 is up first")
while blank_text != text:
letters = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
player1(text, blank_text, letters, 0, 0, 0)
def player1(text, blank_text, letters, player1amount, player2amount, player3amount):
prize = spin_the_wheel()
if prize == "BANKRUPT":
print("Bankrupt")
player1amount = 0
print("We go to player 2 now")
player2(text, blank_text, 0, player2amount, player3amount)
elif prize == "LOSE A TURN":
print("Lose a turn")
print("We go to player 2 now")
player2(text, blank_text, player1amount, player2amount, player3amount)
elif prize == "FREE PLAY":
print("Free Play")
letter = input("Guess a letter: ").upper()
if letter not in text:
letters.remove(letter)
print("There are no " + letter + "'s")
print("We go to player 2 now")
player2(text, blank_text, letters, player1amount, player2amount, player3amount)
elif letter not in letters:
print("That letter's already been called")
print("We go to player 2 now")
player2(text, blank_text, letters, player1amount, player2amount, player3amount)
else:
letters.remove(letter)
if text.count(letter) == 1:
print("There is 1 " + letter)
for i in range(len(text)):
if text == letter:
blank_text = blank_text.replace(blank_text, letter)
print(blank_text)
player1amount += 500
def do():
choice = input("Would you like to spin the wheel, buy a vowel, or solve the puzzle?: ")
if choice == "spin the wheel":
print("OK, spin the wheel")
player1(text, blank_text, letters, player1amount, player2amount, player3amount)
elif choice == "buy a vowel":
vowel = input("OK, buy a vowel: ").upper()
if vowel not in text:
letters.remove(vowel)
print("There are no " + vowel + "'s")
print("We go to player 2 now")
player2(text, blank_text, letters, player1amount, player2amount, player3amount)
elif vowel not in letters:
print("That vowel's already been called")
print("We go to player 2 now")
player2(text, blank_text, letters, player1amount, player2amount, player3amount)
else:
letters.remove(vowel)
if text.count(vowel) == 1:
print("There is 1 " + vowel)
for i in range(len(text)):
if text == vowel:
blank_text = blank_text.replace(blank_text, vowel)
print(blank_text)
do()
else:
n = text.count(vowel)
print("There are " + str(n) + " " + vowel + "'s")
for i in range(len(text)):
if text == vowel:
blank_text = blank_text.replace(blank_text, vowel)
print(blank_text)
do()
elif choice == "solve the puzzle":
solution = input("OK, solve the puzzle: ").upper()
if solution == text:
print("That's right")
print(text)
print("Player 1 amount: $" + str(player1amount))
print("Player 2 amount: $" + str(player2amount))
print("Player 3 amount: $" + str(player3amount))
else:
print("That's not right")
print("We go to player 2 now")
player2(text, blank_text, letters, player1amount, player2amount, player3amount)
do()
else:
n = text.count(letter)
print("There are " + str(n) + " " + vowel + "'s")
for i in range(len(text)):
if text == letter:
blank_text = blank_text.replace(blank_text, letter)
print(blank_text)
p = 500 * n
player1amount += p
def do():
choice = input("Would you like to spin the wheel, buy a vowel, or solve the puzzle?: ")
if choice == "spin the wheel":
print("OK, spin the wheel")
player1(text, blank_text, letters, player1amount, player2amount, player3amount)
elif choice == "buy a vowel":
vowel = input("OK, buy a vowel: ").upper()
if vowel not in text:
letters.remove(vowel)
print("There are no " + vowel + "'s")
print("We go to player 2 now")
player2(text, blank_text, letters, player1amount, player2amount, player3amount)
elif vowel not in letters:
print("That vowel's already been called")
print("We go to player 2 now")
player2(text, blank_text, letters, player1amount, player2amount, player3amount)
else:
letters.remove(vowel)
if text.count(vowel) == 1:
print("There is 1 " + vowel)
for i in range(len(text)):
if text == vowel:
blank_text = blank_text.replace(blank_text, vowel)
print(blank_text)
do()
else:
n = text.count(vowel)
print("There are " + str(n) + " " + vowel + "'s")
l = list(blank_text)
for i in range(len(text)):
if text == vowel:
blank_text = blank_text.replace(blank_text, letter)
print(blank_text)
do()
elif choice == "solve the puzzle":
solution = input("OK, solve the puzzle: ").upper()
if solution == text:
print("That's right")
print(text)
print("Player 1 amount: $" + str(player1amount))
print("Player 2 amount: $" + str(player2amount))
print("Player 3 amount: $" + str(player3amount))
else:
print("That's not right")
print("We go to player 2 now")
player2(text, blank_text, letters, player1amount, player2amount, player3amount)
do()


So, the problem here is that everytime I guess a letter, choose the option "buy a vowel", and guess a vowel that's in the text, it throws out this error:

Traceback (most recent call last):
File "<pyshell#7>", line 1, in <module>
wheel_of_fortune()
File "C:\Users\Harry\Documents\randompythonprograms\wheeloffortune.py", line 19, in wheel_of_fortune
player1(text, blank_text, letters, 0, 0, 0)
File "C:\Users\Harry\Documents\randompythonprograms\wheeloffortune.py", line 97, in player1
do()
File "C:\Users\Harry\Documents\randompythonprograms\wheeloffortune.py", line 82, in do
blank_text = blank_text.replace(blank_text, vowel)
UnboundLocalError: local variable 'blank_text' referenced before assignment


And I just can't seem to figure out what's causing the error, since the code is large, so maybe one of you can figure it out

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