Minimum viable product

flaskr/__init__.py

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+import os
+from flask import Flask
+
+def create_app(test_config=None):
+    # create and configure the app
+    app = Flask(__name__,instance_relative_config=True)
+    app.config.from_mapping(
+        SECRET_KEY='dev',
+        DATABASE=os.path.join(app.instance_path, 'flaskr.sqlite'),
+    )
+
+    if test_config is None:
+        # load the instance config, if it exists, when not testing
+        app.config.from_pyfile('config.py', silent=True)
+    else:
+        # load the test config if passed in
+        app.config.from_mapping(test_config)
+
+    # ensure the instance folder exists
+    try:
+        os.makedirs(app.instance_path)
+    except OSError:
+        pass
+
+    # a simple page that says hello
+    @app.route('/hello')
+    def hello():
+        return 'Hello, World!'
+
+    from . import db
+    db.init_app(app)
+
+    from . import auth
+    app.register_blueprint(auth.bp)
+
+    from . import blog
+    app.register_blueprint(blog.bp)
+    app.add_url_rule('/', endpoint='index')
+
+    return app