First approach from int to string to list

check_numbers1.py

numbers = [] 
for i in range(0,100001): 
    # convert a number to string
    numbers.append(num2words(i))
    
# clean the book and obtain the data list

# for each book collect the number occurrences
numb_dict = {}
for i, book in enumerate(data, 0):
    # split the string from spaces
    splitter = book.split() 
    book_name = book_list[i]
    for number in numbers:
        # count the occurences for a specific number 
        occurrences = splitter.count(number)
        # add this to a counter in the final dictionary
        if book_name in numb_dict:
            numb_dict[book_name][number] = occurrences
        else:
            numb_dict[book_name] = {number:occurrences}