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OK, so I made a FastScrabble game.
My code is currently:

from random import *
from itertools import *
scrabbletiles = []
showntiles = []
def drawtile():
    nexttile = sample(scrabbletiles, 1)
    scrabbletiles.remove(nexttile[0])
    showntiles += nexttile
def possibilities():
    possi = []
    for i in range(2, len(showntiles)+1):
        for word in permutations(showntiles, i):
            wordstring = ""
            for letter in word:
                wordstring += letter
            for WORD in f:
                if wordstring+'\n' == WORD:
                    possi.append(wordstring)
            f.seek(0)
def makechoice():
    print "1: draw new tile"
    print "2: attempt to form a word"
    choice = raw_input("Make choice! Make here: ")
    if choice == "1":
        drawtile()
    elif choice == "2":
        guess()
        drawtile()
    else:
        makechoice()
def guess():
    scoreadd = 0
    get = False
    guess = raw_input("Make guess! Make here: ").upper()
    for WORD in f:
        if guess+'\n' == WORD:
            get = True
    if get == True:
        for letter in guess:
            scoreadd += scrabbleD[letter][2]
            showntiles.remove()
        playerscore += scoreadd
        print "Yes! Now you have", playerscore, "points. Turn is us."
    else:
        tryagain = raw_input("Try again yes/no make choice! Make here: ")
        if tryagain[0].upper() == "Y":
            guess()
        else:
            scoreadd = 10
            compuscore += scoreadd
            print "Oh noes! You are fail, we get points. Turn is us!"
def computurn():
    print "Turn is us! We take turn."
    choicetime = randint(37, 100)
    if choicetime == 77:
        "We see word! We make word."
        possibilities()
        if len(possi) == 0:
            "Oops. We no see word. You get points. Turn is you."
            playerscore += 10
        else:
            scoreadd = 0
            choice(possi)
            for letter in guess:
                scoreadd += scrabbleD[letter][2]
                showntiles.remove()
            compuscore += scoreadd
        print "Yes! Now we have", compuscore, "points. Turn is you."
        drawtile()
    else:
        print "We no see word. We make draw. Turn is you."
        drawtile()
def finchoice():
    if raw_input("Last guess yes/no make choice! Make here: ")[0].upper() == 'Y':
        guess()
    else:
        pass
def fingame():
    print "You has", playerscore, "points."
    print "We has", compuscore, "points."
    scoredict = {playerscore: "You", compuscore: "We"}.items().sort()
    print scoredict[0][1], "is win!"
    play = raw_input("Play again make choice! Make here: ")
scrabbleD = {
'A': (9, 1),
'B': (2, 3),
'C': (2, 3),
'D': (4, 2),
'E': (12, 1),
'F': (2, 4),
'G': (3, 2),
'H': (2, 4),
'I': (9, 1),
'J': (1, 8),
'K': (1, 5),
'L': (4, 1),
'M': (2, 3),
'N': (6, 1),
'O': (8, 1),
'P': (2, 3),
'Q': (1, 10),
'R': (6, 1),
'S': (4, 1),
'T': (6, 1),
'U': (4, 1),
'V': (2, 4),
'W': (2, 4),
'X': (1, 8),
'Y': (2, 4),
'Z': (1, 10)
}
f = open('C:\Python26\dictionary.txt')
play = 'Y'
while play[0].upper() == 'Y':
    scrabbletiles = []
    showntiles = []
    playerscore = 0
    compuscore = 0
    for letter, (freq, val) in scrabbleD.iteritems():
        for i in range(freq):
            scrabbletiles.append(letter)
    drawtile()
    drawtile()
    drawtile()
    print showtiles
    while len(scrabbletiles) > 0:
        print showtiles
        makechoice()
        if len(scrabbletiles) > 0:
            print showtiles
            computurn()
        else:
            break
    finchoice()
    fingame()

And when I run it, it... it gives me this.

Traceback (most recent call last):
  File "S:\Bell Work\FastScrabble.py", line 127, in <module>
    drawtile()
  File "S:\Bell Work\FastScrabble.py", line 10, in drawtile
    showntiles += nexttile
UnboundLocalError: local variable 'showntiles' referenced before assignment

I researched UnboundLocalError... and based on what I found, it doesn't make sense. It says that it is referred to before being given a value...
Well, unless I'm wrong, I made it an empty list not only in my main while loop, but before I even defined my functions...
Uhm...
This could be a bug, or I could have made a mistake in my assumption. Or worse yet I have no true understanding of the error in question.
... Help, please?

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