> -PROJECT DIR
>     -APP
>         -API
>         -HANDLERS
>             home.py
>         -TEMPLATES
>             home.html
          - flask_app.py
>     app.yaml
>     appengine.config.pu

from flask import render_template
from app.flask_app import app

@app.route('/')
def home():
    return render_template('home.html')

runtime: python27
 api_version: 1
 threadsafe: true

 handlers:
 - url: /.*
 script: app.flask_app.app

import appengine_config
import logging

from app import app_secret_key
from flask import Flask
from flask_wtf.csrf import CSRFProtect



app = Flask(__name__)
app.config.from_object(__name__)
CSRF_PROTECT = CSRFProtect(app)


if appengine_config.GAE_DEV:
    logging.warning('Using a dummy secret key')
    app.secret_key = 'my_dummy_secret_key'
    app.debug = True
else:
    app.secret_key = app_secret_key.secret_key