def get_all_post_id():
    sleep(1)
    offset = 0
    arr_posts_id = []
    while True:
        sleep(1)
        r = requests.get('https://api.vk.com/method/wall.get',
                         params={'owner_id': group_id, 'count': 100,
                                  'offset': offset, 'access_token': token,
                                   'v': version})
        for i in range(100):
            post_id = r.json()['response']['items'][i]['id']
            arr_posts_id.append(post_id)
        if offset > 20000:
            break
        offset += 100
    return arr_posts_id
def get_all_comments(arr_posts_id):
    offset = 0
    for post_id in arr_posts_id:
        r = requests.get('https://api.vk.com/method/wall.getComments',
                         params={'owner_id': group_id, 'post_id': post_id,
                                 'count': 100, 'offset': offset,
                                 'access_token': token, 'v': version})
        for i in range(100):
            try:
                write_txt('comments.txt', r.json()
                ['response']['items'][i]['text'])
            except IndexError:
                pass

f = open('comments.txt')
counter = Counter(f.read().lower())
def count_letters():
    count = 0
    for i in range(len(arr_letters)):
        count += counter[arr_letters[i]]
    return count
def frequency(count):
    arr_my_frequency = []
    for i in range(len(arr_letters)):
        frequency = counter[arr_letters[i]] / count * 100
        arr_my_frequency.append(frequency)
    return arr_my_frequency

def caesar_cipher():
    file = open("text.txt")
    text_for_encrypt = file.read().lower().replace(',', '')
    letters = 'абвгдеёжзийклмнопрстуфхцчшщъыьэюя'
    arr = []
    step = 3
    for i in text_for_encrypt:
        if i == ' ':
            arr.append(' ')
        else:
            arr.append(letters[(letters.find(i) + step) % 33])
    text_for_decrypt = ''.join(arr)
    return text_for_decrypt

def decrypt_text(text_for_decrypt, arr_decrypt_letters):
    arr_encrypt_text = []
    arr_encrypt_letters = [' ', 'о', 'а', 'е', 'и', 'т', 'н', 'л',
                           'р', 'с', 'в', 'к', 'м', 'д', 'у', 'п',
                           'б', 'г', 'ы', 'ч', 'ь', 'з', 'я', 'й',
                           'х', 'ж', 'ш', 'ю', 'ф', 'э', 'щ',
                           'ё', 'ц', 'ъ']
    dictionary = dict(zip(arr_decrypt_letters, arr_encrypt_letters))
    for i in text_for_decrypt:
        arr_encrypt_text.append(dictionary.get(i))
    text_for_decrypt = ''.join(arr_encrypt_text)
    print(text_for_decrypt)