blog.py

from flask import Flask, request
from app.config import Config
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from flask_login import LoginManager
from flask_mail import Mail
from flask_bootstrap import Bootstrap
from flask_moment import Moment
from flask_babel import Babel, lazy_gettext as _l

app = Flask(__name__)

login = LoginManager(app)
login.login_view = 'loginUser'
login.login_message = _l('Please log in to access this page.')

app.config.from_object(Config)

db = SQLAlchemy(app)
migrate = Migrate(app, db)
mail = Mail(app)
bootstrap = Bootstrap(app)
moment = Moment(app)
babel = Babel(app)

from app import routes, errors, models

@babel.localeselector
def get_locale():
    return request.accept_languages.best_match(app.config['LANGUAGES'])