Connect 4 - make_board

def make_board():
    global rows,columns
    global board
    rows = input("Bitte Zeilen angeben(mehr als 4): ")
    print " ----- ---------- ------ ------ ----- ----- "
    columns = input("Bitte Spalten angeben(mehr als 4): ")

    board = dict()
    min = 4
    if rows<min:
        make_board()
    elif columns<min:
        make_board()
    for x in range(rows):
        for y in range(columns):
            #board = (x+1,y+1)
            board[(x,y)] = "LeereZellen"
    return board

#CHOOSE PLAYER FUNCTION

def choose_player():
    choose = input("Spieler 1 vs. Computer [1 eintippen] - Spieler 1 vs. Spieler 2 [2 eintippen]: ")
    if choose == 1:
        #p1 vs. computer
        choose_1()
    elif choose == 2:
        choose_2()
    else:
        choose_player()

#BLANKS EXIST

def blanks_exist():
    for x in range(rows):
        for y in range(columns):
            if board[(x,y)] == "LeereZellen":
                return True
        return False

def print_board():
    for x in range(rows):
        print "|",
        for y in range(columns):
            if board[(x,y)] == "LeereZellen": print " |",
            else: print board[(x,y)], "|",
            print ""