One Chrome browser window in selenium webdriver --python - python-2.7

Question

I have some issue with the init constructor related to selenium webdriver's chrome instances.
Here are the pieces of my scripts:
First one named methods.py
from selenium import webdriver
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
import paths
class PagePatterns(object):
def __init__(self, title=None):
self.driver = webdriver.Chrome('C:\Python27\chromedriver.exe')
self.title = title
def get_page_title(self):
return self.get_driver().title
Second one named login.py
from utils.methods import PagePatterns
from selenium.webdriver.common.by import By
from utils import paths
methods = PagePatterns()
class LoginPage(object):
def login(self):
country_choose = (By.XPATH, paths.country_list_login)
methods.click(country_choose)
Next one - register.py
from utils.methods import PagePatterns
from selenium.webdriver.common.by import By
from utils import utils, paths
from selenium.webdriver.support.wait import WebDriverWait
methods = PagePatterns()
class MainPage(object):
def open_homepage(self):
methods.open_base_page()
title_check = methods.get_page_title()
assert title_check == paths.page_title
The last one main_test.py is using LoginPage class
from register import MainPage
from login import LoginPage
MainPage().open_homepage()
LoginPage().login()
That's all about the code. My question is - when I am running main_test.py Chrome is called two times (two windows), but I want only one window of the browser - how to make it?
Thanks.