flaskr/__init__.py


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import os

from flask import Flask


def create_app(test_config=None):
    # Create app object.  Configuration files are relative to instance folder.
    app = Flask(__name__, instance_relative_config=True)

    # Config
    app.config.from_mapping(
        SECRET_KEY='dev',
        DATABASE=os.path.join(app.instance_path, 'flaskr.sqlite'),
    )

    if test_config is None:
        app.config.from_pyfile('config.py', silent=True)
    else:
        app.config.from_mapping(test_config)

    try:
        os.makedirs(app.instance_path)
    except OSError:
        pass

    # Routes
    @app.route('/hello')
    def index():
        return 'Hello, World!'

    # Register functions and blueprints
    from . import db
    db.init_app(app)

    from .views import auth
    app.register_blueprint(auth.bp)

    from .views import blog
    app.register_blueprint(blog.bp)

    # Extra
    app.add_url_rule('/', endpoint='index')

    return app