Password Guesser Project

[RedSkeleton007]

Next little problem. It says my syntax for guessMatches is invalid. How do I correctly declare a boolean variable?

#!/usr/bin/env python3
#PasswordGuesser.py

AlphaNum = "abc"
guess = ""
bool guessMatches = false
password = "b"
guessLength = len(guess)
guessLength = 1 #start with a guess length of just one char

def iterateAlphaNum():
    i = 0
    while i < len(AlphaNum):
        guess[0] == AlphaNum[i]
        i += 1


#Master While Loop: while the last char of the guess string has not yet passed
#the last char in AlphaNum
while guess[len(guess)-1] <= AlphaNum[len(AlphaNum)-1]:
    guess[0] = iterateAlphaNum()
    print(guess)
    if guess == password:
        guessMatches = true
        print()
        print("Found the password! It's " + str(guess))
        break