config.py

import os
base_dir = os.path.abspath(os.path.dirname(__file__))
class Config(object):
    SECRET_KEY=os.environ.get("SECRET_KEY") or \
        "tmp dfdfmkldsj"
    SQLALCHEMY_DATABASE_URI=os.environ.get("DATABASE_URL") or \
        "sqlite:///" + os.path.join(base_dir, "app.db")
    SQLALCHEMY_TRACK_MODIFICATIONS=False
    MAIL_SERVER = os.environ.get('MAIL_SERVER')
    MAIL_PORT = int(os.environ.get('MAIL_PORT') or 25)
    MAIL_USE_TLS = os.environ.get('MAIL_USE_TLS') is not None
    MAIL_USERNAME = os.environ.get('MAIL_USERNAME')
    MAIL_PASSWORD = os.environ.get('MAIL_PASSWORD')
    ADMINS = ['tranxuanthuy.ds@gmail.com']
    POSTS_PER_PAGE = 25