code your own quiz

import string

easy_string = ("\nA neutron star is the result of a __1__. __1__e are the cataclysmic deaths of __2__ greater than the size of our own.\n" \
               "Another result of __1__ are __3__. __3__ come from __2__ of even greater mass than those that create neutron stars.\n" \
               "Neutron stars can be pushed to __1__ if too much __4__ falls into them.")
easy_answers = ['supernova', 'stars', 'black holes', 'mass']
easy_blanks = ['__1__','__2__','__3__','__4__'] 

medium_string = ("\nCaesar's De Bello Gallico\n" \
                 "\nGallia __1__ omnis divisa in partes tres, quarum unam incolunt __2__, aliam __3__, tertiam qui ipsorum lingua __4__, nostra __5__ appellantur.")
medium_answers = ['est', 'Belgae', 'Aquitani', 'Celtae', 'Galli']
medium_blanks = ['__1__','__2__','__3__','__4__','__5__'] 

hard_string = ("\nTrigonometry is the study of __1__. __1__ are more interesting than they might seem at first. With them, you can measure __2__. \n" \
               "Using Trigonometry functions, such as Sine, __3__, and __4__, you can discover myriads of information, and compare them to other \n" \
               "__1__ to do some pretty cool stuff.")
hard_answers = ['right triangles', 'distance', 'Cosine', 'Tangent']
hard_blanks = ['__1__','__2__','__3__','__4__']

count = 1

def import_params(selection):
    #import_params takes as input the difficulty from run_quiz and it returns the corresponding string,
    #blanks list, and answers.
    if selection == 'easy':
        return easy_string, easy_blanks, easy_answers, count
    elif selection == 'medium':
        return medium_string, medium_blanks, medium_answers, count
    elif selection == 'hard':
        return hard_string, hard_blanks, hard_answers, count
    else:
        return -1, -1, -1, -1

def num_check(error_quantity):
    #num_convert takes as input error_quantity from run_quiz and returns its integer form.
    #If error_quantity is not from 0 to 10 then it returns -1.
    try: 
        int(error_quantity)
        if int(error_quantity) >= 0:
            return int(error_quantity)
        else:
            return -1
    except ValueError:
        return -1
    
def is_answer(user_input, string_answers, blank):
    #is_answer takes as input user_input, string_answers, and blank sent from run_quiz.
    #It returns True or False depending on whether the answer is correct.
    blank = blank.split('__')
    raw_number = blank[1] 
    set_index_position = -1
    if user_input == string_answers[int(raw_number) + set_index_position]:
        return True
    else:
        return False

def ask_for_answer(quiz_string, quiz_blanks, quiz_answers, count, error_quantity):
    #ask_for_answer takes as input quiz_string, quiz_blanks, quiz_answers, count, and error_quantity
    #sent from run_quiz. It returns the modified quiz_string if the answer is correct. If not then it
    #returns an error or -1 depending on the state of error_quantity. 
    while count <= len(quiz_blanks):
        blank = '__' + str(count) + '__'
        if blank in quiz_string:
            print(quiz_string)
            user_input = raw_input('\nWhat shall the replacement be for ' + str(blank) + ' , Sire? \n:')
            answer = is_answer(user_input, quiz_answers, blank)
            if answer == True:
                quiz_string = string.replace(quiz_string, blank, user_input)
                count += 1
            elif answer == False and error_quantity > 1:
                print ('\nIncorrect. Try again.\n' + str(error_quantity) + ' attempts left.')
                error_quantity -= 1
            elif answer == False and error_quantity == 1:
                print ('\nIncorrect. Try again.\n' + str(error_quantity) + ' attempt left.')
                error_quantity -= 1
            elif answer == False and error_quantity == 0:
                return -1                
    
def run_quiz():
    #run_quiz takes as input the difficulty and amount of errors allowed. It is the main function that
    #ties all the other functions together. If user gets through the quiz then it returns 'YOU WON'.If
    #the user does not get through quiz then it returns 'GAME OVER'. 
    while True:
        selection = raw_input('Select a difficulty:\neasy | medium | hard\n:')
        quiz_string, quiz_blanks, quiz_answers, count = import_params(selection)
        if quiz_string == -1:
            print ('\nInvalid difficulty. Try again.\n')
        else:
            while True:
                number_input = raw_input('\nHow many errors are allowed?\n:')
                error_quantity = num_check(number_input)
                if error_quantity == -1:
                    print ('\nInvalid number, try again.\nType number not word (ex."1" not "one").\nNumber must be greater than or equal to zero.') 
                else:
                    result = ask_for_answer(quiz_string, quiz_blanks, quiz_answers, count, error_quantity)
                    if result == -1:
                        return ('\n*************\n* GAME OVER *\n*************')
                    else:
                        return ('\n************\n* YOU WON! *\n************')
                
print run_quiz()