import pickle
import gzip


def get_unique_words(corpus_filename):
    """
    Get a list of unique words from a corpus file
    """
    unique_words = set()
    with open(corpus_filename, 'r', encoding='utf-8') as file:
        for line in file:
            words = line.strip().split()
            unique_words.update(words)
    return list(unique_words)


def save_compressed_word_list(words, filename):
    """
    Save a list of words to a compressed file
    """
    with gzip.open(filename, 'wb') as file:
        pickle.dump(words, file)
     
        
def load_compressed_word_list(filename):
    """
    Load a list of words from a compressed file
    """
    with gzip.open(filename, 'rb') as file:
        return pickle.load(file)
    

def get_autocomplete(input_word=" ", all_words=" "):
    """
    Get a list of words that start with the input word
    """
    return [word for word in all_words if word.startswith(input_word)]