file_in_use = 'farsi_words'

def defaultFile(filename):
    file_in_use = filename
    return file_in_use

bN = Button(f0, text = 'Nouns', command =lambda: defaultFile('farsi_words'))
bN.pack(side='left')
bN.bind("<Button-1>",
bV = Button(f0, text = 'Verbs', command =lambda: defaultFile('farsi_verbs'))
bV.pack(side='left')
bA = Button(f0, text = 'Adjectives', command =lambda: defaultFile('farsi_adjectives'))
bA.pack(side='left')
bP = Button(f0, text = 'Prepositions', command =lambda: defaultFile('farsi_preps'))
bP.pack(side='left')

def commit(file_in_use):
    word = e1.get()
    definition = e2.get()
    appendFile = open(file_in_use, 'a')#was this defined before def?
    appendFile.write('n' + word + ': ' + definition)
    appendFile.close()
    e1.delete(0, 'end')
    e2.delete(0, 'end')

def review(file_in_use):
    t1.delete('1.0', END)
    readFile = open(file_in_use, 'r')
    size = 0
    splitList = []
    for line in readFile:
        splitWord = line.split(':')
        splitWord = splitWord[0].strip('n ')
        splitList.append(splitWord)
        size += 1

    n = random.randint(0, size - 1)
    t1.insert(INSERT, splitList[n] + 'n')
    readFile.close()

def answer(file_in_use):
    word = e3.get()
    def1 = t1.get('1.0','end-1c')
    def1 = def1.strip('n')
    readFile = open(file_in_use, 'r')
    for line in readFile:
        splitWord = line.split(': ')
        if def1 == splitWord[0].strip('n'):
            if word == splitWord[1].strip('n'):
                t1.insert(INSERT, 'Good job!')
            else:
                t1.insert(INSERT, 'Not quite! Good try =)')
    readFile.close()

def hint(file_in_use):
    def1 = t1.get('1.0','2.0')
    def1 = def1.strip('n')
    readFile = open(file_in_use, 'r')

    for line in readFile:
        splitWord = line.split(': ')
        if def1 == splitWord[0].strip('n'):
            hint = splitWord[1]

    hint1 = t1.get('2.0','end-1c')
    lenHint1 = len(hint1)
    if lenHint1 >= len(hint):
        pass
    else:
        t1.insert(INSERT, hint[lenHint1])
        print (hint1)
    readFile.close()