Divided html into templates

app.py

@@ -1,4 +1,5 @@
 from flask import Flask, render_template
+from os import environ
 from web import blueprint
 '''
     Main entrypoint for Flask application. 
@@ -8,6 +9,15 @@ from web import blueprint
 def main():
     app = Flask(__name__)
 
+    # Set app secret key to sign session cookies
+    secret_key = environ.get("APPSECRET")
+    if secret_key == None:
+        # NO Secret Key set!
+        print("No app secret set, please set one before deploying in production")
+        app.secret_key = "DEFUALTKEY"
+    else:
+        app.secret_key = secret_key
+
     # Register a blueprint 
     app.register_blueprint(blueprint)
     app.run(debug=True)