dumb_mes_download

import vk
import re
import sys
import time

def wait_sec(n):
    start = time.time()
    while time.time() - start < n:
        pass


f = open('out.txt', 'w')
sys.stdout = f

def delTrash(message):
    trash = re.compile('[^a-zA-Zа-яA-я0-9.!?,-/\() ]')
    message = trash.sub('', message)
    return re.sub(r'\s+', ' ', message)

login = input('login: ')
password = input('password: ')
target_id = input('target id: ')

session = vk.AuthSession(app_id='2685278', user_login=login, user_password=password)
vk_api = vk.API(session)

params = {  'user_id': target_id,
            'v': '5.38'}

data = vk_api.messages.getHistory(**params)

quantity = data['count']
processed = 0
offset = 0


while processed != quantity:
    if quantity - processed < 200:
        count = quantity - processed
    else:
        count = 200

    params = {  'user_id': target_id,
                'count' : count,
                'offset' : offset,
                'v': '5.38'}

    data = vk_api.messages.getHistory(**params)

    for i in range(count):
        if data['items'][i]['from_id'] == int(target_id):
            message = data['items'][i]['body']
            while message.count('\n') > 0:
                message = message.replace('\n', ' ')
            message = delTrash(message)
            message = message.encode('cp866', errors='ignore').decode('cp866')
            if message != '':
                print(message)
                done += 1

    processed += count
    offset += count
    wait_sec(1)